Add interactive routine wizard, slider controls, value persistence, and timer pause

- Interactive routine generation wizard with AI refinement loop (generate-draft,
  refine, save-draft endpoints + RoutineWizard modal component)
- Replace +/- stepper buttons with slider controls for reps/weight during workout
- Persist user-modified reps/weight across sets of the same exercise
- Add pause/resume by tapping timer dials, with back-button confirmation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/ai/kettlebell.py

@@ -55,3 +55,47 @@ class KettlebellModule(dspy.Module):
 
 
 kettlebell_module = KettlebellModule()
+
+
+class RefineKettlebellSession(dspy.Signature):
+    """Refine an existing kettlebell workout session based on user feedback.
+
+    You are given the current session and the user's feedback. Apply the requested changes
+    while keeping the rest of the session intact. Maintain proper exercise sequencing,
+    warm-up/cooldown structure, and ensure total work time still fits the target duration.
+    """
+
+    current_session: str = dspy.InputField(desc="JSON representation of the current session")
+    user_feedback: str = dspy.InputField(desc="User's requested changes to the session")
+    user_profile: str = dspy.InputField(desc="User details including age, weight, fitness level, and goals")
+    available_weights_kg: str = dspy.InputField(desc="Comma-separated list of available kettlebell weights in kg")
+    focus: str = dspy.InputField(desc="Session focus: strength, conditioning, mobility, fat loss, etc.")
+    duration_minutes: int = dspy.InputField(desc="Target session duration in minutes")
+    session: KettlebellSessionOutput = dspy.OutputField(desc="Refined structured kettlebell session")
+
+
+class KettlebellRefineModule(dspy.Module):
+    def __init__(self):
+        super().__init__()
+        self.refine = dspy.ChainOfThought(RefineKettlebellSession)
+
+    def forward(
+        self,
+        current_session: str,
+        user_feedback: str,
+        user_profile: str,
+        available_weights_kg: str,
+        focus: str,
+        duration_minutes: int,
+    ):
+        return self.refine(
+            current_session=current_session,
+            user_feedback=user_feedback,
+            user_profile=user_profile,
+            available_weights_kg=available_weights_kg,
+            focus=focus,
+            duration_minutes=duration_minutes,
+        )
+
+
+kettlebell_refine_module = KettlebellRefineModule()

backend/app/api/v1/endpoints/kettlebell.py

@@ -1,3 +1,4 @@
+import json
 from collections import defaultdict
 from datetime import datetime, timedelta
 from typing import Any, Dict, List, Optional
@@ -6,7 +7,7 @@ from fastapi import APIRouter, Depends, HTTPException
 from pydantic import BaseModel
 from sqlmodel import Session, select
 
-from app.ai.kettlebell import kettlebell_module
+from app.ai.kettlebell import kettlebell_module, kettlebell_refine_module
 from app.api import deps
 from app.models.kettlebell import KettlebellSession, KettlebellSetLog
 
@@ -19,6 +20,39 @@ class KettlebellGenerateRequest(BaseModel):
     available_weights: list[float]
 
 
+class DraftExercise(BaseModel):
+    order: int
+    name: str
+    description: str
+    sets: int
+    reps: int
+    duration_seconds: int
+    weight_kg: float
+    rest_seconds: int
+    coaching_tip: str
+
+
+class DraftSession(BaseModel):
+    title: str
+    focus: str
+    total_duration_min: int
+    difficulty: str
+    exercises: list[DraftExercise]
+    notes: str
+
+
+class RefineRequest(BaseModel):
+    draft: DraftSession
+    feedback: str
+    focus: str
+    duration_minutes: int
+    available_weights: list[float]
+
+
+class SaveDraftRequest(BaseModel):
+    draft: DraftSession
+
+
 class LogSetRequest(BaseModel):
     exercise_order: int
     set_number: int
@@ -178,6 +212,102 @@ def get_analytics(
     )
 
 
+@router.post("/generate-draft", response_model=DraftSession)
+def generate_draft(
+    *,
+    current_user: deps.CurrentUser,
+    request: KettlebellGenerateRequest,
+) -> Any:
+    """Generate a draft kettlebell session (not saved to DB) for review."""
+    try:
+        user_profile = (
+            f"Age: {current_user.age or 'unknown'}, "
+            f"Gender: {current_user.gender or 'unknown'}, "
+            f"Weight: {current_user.weight or 'unknown'} kg, "
+            f"Height: {current_user.height or 'unknown'} cm"
+        )
+        available_weights_kg = ", ".join(str(w) for w in sorted(request.available_weights))
+        generated = kettlebell_module(
+            user_profile=user_profile,
+            available_weights_kg=available_weights_kg,
+            focus=request.focus,
+            duration_minutes=request.duration_minutes,
+        )
+        s = generated.session
+        return DraftSession(
+            title=s.title,
+            focus=s.focus,
+            total_duration_min=s.total_duration_min,
+            difficulty=s.difficulty,
+            exercises=[DraftExercise(**ex.model_dump()) for ex in s.exercises],
+            notes=s.notes,
+        )
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@router.post("/refine", response_model=DraftSession)
+def refine_draft(
+    *,
+    current_user: deps.CurrentUser,
+    request: RefineRequest,
+) -> Any:
+    """Refine a draft session based on user feedback."""
+    try:
+        user_profile = (
+            f"Age: {current_user.age or 'unknown'}, "
+            f"Gender: {current_user.gender or 'unknown'}, "
+            f"Weight: {current_user.weight or 'unknown'} kg, "
+            f"Height: {current_user.height or 'unknown'} cm"
+        )
+        available_weights_kg = ", ".join(str(w) for w in sorted(request.available_weights))
+        current_session_json = json.dumps(request.draft.model_dump(), indent=2)
+        generated = kettlebell_refine_module(
+            current_session=current_session_json,
+            user_feedback=request.feedback,
+            user_profile=user_profile,
+            available_weights_kg=available_weights_kg,
+            focus=request.focus,
+            duration_minutes=request.duration_minutes,
+        )
+        s = generated.session
+        return DraftSession(
+            title=s.title,
+            focus=s.focus,
+            total_duration_min=s.total_duration_min,
+            difficulty=s.difficulty,
+            exercises=[DraftExercise(**ex.model_dump()) for ex in s.exercises],
+            notes=s.notes,
+        )
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@router.post("/save-draft", response_model=KettlebellSession)
+def save_draft(
+    *,
+    current_user: deps.CurrentUser,
+    request: SaveDraftRequest,
+    session: Session = Depends(deps.get_session),
+) -> Any:
+    """Save a finalized draft as a new session."""
+    draft = request.draft
+    kb_session = KettlebellSession(
+        user_id=current_user.id,
+        title=draft.title,
+        focus=draft.focus,
+        exercises={"exercises": [ex.model_dump() for ex in draft.exercises]},
+        total_duration_min=draft.total_duration_min,
+        difficulty=draft.difficulty,
+        notes=draft.notes,
+        status="generated",
+    )
+    session.add(kb_session)
+    session.commit()
+    session.refresh(kb_session)
+    return kb_session
+
+
 @router.post("/generate", response_model=KettlebellSession)
 def generate_session(
     *,

frontend/src/api/kettlebell.ts

@@ -1,5 +1,5 @@
 import client from './client';
-import type { KettlebellSession, KettlebellSetLog } from '../types/kettlebell';
+import type { KettlebellSession, KettlebellSetLog, DraftSession } from '../types/kettlebell';
 
 export interface GenerateSessionRequest {
     focus: string;
@@ -7,6 +7,18 @@ export interface GenerateSessionRequest {
     available_weights: number[];
 }
 
+export interface RefineRequest {
+    draft: DraftSession;
+    feedback: string;
+    focus: string;
+    duration_minutes: number;
+    available_weights: number[];
+}
+
+export interface SaveDraftRequest {
+    draft: DraftSession;
+}
+
 export interface LogSetRequest {
     exercise_order: number;
     set_number: number;
@@ -49,3 +61,12 @@ export const abandonSession = (id: number) =>
 
 export const deleteSession = (id: number) =>
     client.delete(`/kettlebell/${id}`);
+
+export const generateDraft = (data: GenerateSessionRequest) =>
+    client.post<DraftSession>('/kettlebell/generate-draft', data).then(r => r.data);
+
+export const refineDraft = (data: RefineRequest) =>
+    client.post<DraftSession>('/kettlebell/refine', data).then(r => r.data);
+
+export const saveDraft = (data: SaveDraftRequest) =>
+    client.post<KettlebellSession>('/kettlebell/save-draft', data).then(r => r.data);

frontend/src/components/kettlebell/ElapsedTimer.tsx

@@ -14,7 +14,12 @@ export function ElapsedTimer({ seconds }: ElapsedTimerProps) {
     );
 }
 
-export function ElapsedTimerCircle({ seconds }: ElapsedTimerProps) {
+interface ElapsedTimerCircleProps extends ElapsedTimerProps {
+    paused?: boolean;
+    onClick?: () => void;
+}
+
+export function ElapsedTimerCircle({ seconds, paused, onClick }: ElapsedTimerCircleProps) {
     const h = Math.floor(seconds / 3600);
     const m = Math.floor((seconds % 3600) / 60);
     const s = seconds % 60;
@@ -24,7 +29,12 @@ export function ElapsedTimerCircle({ seconds }: ElapsedTimerProps) {
 
     return (
         <div className="flex items-center justify-center py-4">
-            <div className="relative w-48 h-48">
+            <div
+                className={`relative w-48 h-48 ${onClick ? 'cursor-pointer' : ''} ${paused ? 'animate-pulse' : ''}`}
+                onClick={onClick}
+                role={onClick ? 'button' : undefined}
+                aria-label={onClick ? (paused ? 'Resume timer' : 'Pause timer') : undefined}
+            >
                 <svg className="w-full h-full -rotate-90" viewBox="0 0 160 160">
                     <circle
                         cx="80" cy="80" r={radius}
@@ -41,13 +51,14 @@ export function ElapsedTimerCircle({ seconds }: ElapsedTimerProps) {
                         strokeLinecap="round"
                         strokeDasharray={circumference}
                         strokeDashoffset={circumference * 0.25}
-                        className="text-primary"
+                        className={paused ? 'text-amber-400' : 'text-primary'}
                     />
                 </svg>
-                <div className="absolute inset-0 flex items-center justify-center">
+                <div className="absolute inset-0 flex flex-col items-center justify-center">
                     <span className="text-4xl font-mono font-bold tabular-nums text-content">
                         {h > 0 ? `${pad(h)}:` : ''}{pad(m)}:{pad(s)}
                     </span>
+                    {paused && <span className="text-xs text-amber-400 font-semibold mt-1">PAUSED</span>}
                 </div>
             </div>
         </div>

frontend/src/components/kettlebell/RestCountdown.tsx

@@ -1,9 +1,11 @@
 interface RestCountdownProps {
     remaining: number;
     total: number;
+    paused?: boolean;
+    onClick?: () => void;
 }
 
-export function RestCountdown({ remaining, total }: RestCountdownProps) {
+export function RestCountdown({ remaining, total, paused, onClick }: RestCountdownProps) {
     const radius = 54;
     const circumference = 2 * Math.PI * radius;
     const progress = total > 0 ? remaining / total : 0;
@@ -15,7 +17,12 @@ export function RestCountdown({ remaining, total }: RestCountdownProps) {
 
     return (
         <div className="flex items-center justify-center">
-            <div className="relative w-36 h-36">
+            <div
+                className={`relative w-36 h-36 ${onClick ? 'cursor-pointer' : ''} ${paused ? 'animate-pulse' : ''}`}
+                onClick={onClick}
+                role={onClick ? 'button' : undefined}
+                aria-label={onClick ? (paused ? 'Resume timer' : 'Pause timer') : undefined}
+            >
                 <svg className="w-full h-full -rotate-90" viewBox="0 0 120 120">
                     <circle
                         cx="60" cy="60" r={radius}
@@ -32,13 +39,14 @@ export function RestCountdown({ remaining, total }: RestCountdownProps) {
                         strokeLinecap="round"
                         strokeDasharray={circumference}
                         strokeDashoffset={dashOffset}
-                        className="text-primary transition-all duration-1000"
+                        className={`transition-all duration-1000 ${paused ? 'text-amber-400' : 'text-primary'}`}
                     />
                 </svg>
-                <div className="absolute inset-0 flex items-center justify-center">
+                <div className="absolute inset-0 flex flex-col items-center justify-center">
                     <span className="text-3xl font-mono font-bold tabular-nums text-content">
                         {pad(m)}:{pad(s)}
                     </span>
+                    {paused && <span className="text-xs text-amber-400 font-semibold mt-1">PAUSED</span>}
                 </div>
             </div>
         </div>

frontend/src/components/kettlebell/RoutineWizard.tsx

@@ -0,0 +1,254 @@
+import { useState, FormEvent, useRef, useEffect } from 'react';
+import { toast } from 'sonner';
+import { Dialog, DialogTitle, DialogBody } from '../catalyst/dialog';
+import { Button } from '../catalyst/button';
+import { Field, Label } from '../catalyst/fieldset';
+import { Input } from '../catalyst/input';
+import { generateDraft, refineDraft, saveDraft } from '../../api/kettlebell';
+import type { DraftSession } from '../../types/kettlebell';
+import type { KettlebellSession } from '../../types/kettlebell';
+
+const FOCUS_OPTIONS = ['strength', 'conditioning', 'fat loss', 'mobility', 'endurance'];
+const DURATION_OPTIONS = [20, 30, 45, 60];
+
+type WizardStep = 'configure' | 'review' | 'saving';
+
+interface Message {
+    role: 'user' | 'assistant';
+    text: string;
+}
+
+interface RoutineWizardProps {
+    open: boolean;
+    onClose: () => void;
+    onSaved: (session: KettlebellSession) => void;
+}
+
+export function RoutineWizard({ open, onClose, onSaved }: RoutineWizardProps) {
+    const [step, setStep] = useState<WizardStep>('configure');
+    const [focus, setFocus] = useState('strength');
+    const [duration, setDuration] = useState(30);
+    const [weightsInput, setWeightsInput] = useState('16, 24, 32');
+    const [loading, setLoading] = useState(false);
+    const [draft, setDraft] = useState<DraftSession | null>(null);
+    const [feedback, setFeedback] = useState('');
+    const [messages, setMessages] = useState<Message[]>([]);
+    const chatEndRef = useRef<HTMLDivElement>(null);
+
+    useEffect(() => {
+        chatEndRef.current?.scrollIntoView({ behavior: 'smooth' });
+    }, [messages]);
+
+    // Reset state when dialog opens
+    useEffect(() => {
+        if (open) {
+            setStep('configure');
+            setDraft(null);
+            setMessages([]);
+            setFeedback('');
+            setLoading(false);
+        }
+    }, [open]);
+
+    const parseWeights = () =>
+        weightsInput.split(',').map(s => parseFloat(s.trim())).filter(n => !isNaN(n) && n > 0);
+
+    const handleGenerate = async (e: FormEvent) => {
+        e.preventDefault();
+        setLoading(true);
+        try {
+            const available_weights = parseWeights();
+            const result = await generateDraft({ focus, duration_minutes: duration, available_weights });
+            setDraft(result);
+            setMessages([{ role: 'assistant', text: `Generated "${result.title}" — ${result.difficulty} ${result.focus} session, ${result.total_duration_min} min with ${result.exercises.length} exercises.` }]);
+            setStep('review');
+        } catch {
+            toast.error('Failed to generate session');
+        } finally {
+            setLoading(false);
+        }
+    };
+
+    const handleRefine = async (e: FormEvent) => {
+        e.preventDefault();
+        if (!draft || !feedback.trim()) return;
+        const userMsg = feedback.trim();
+        setFeedback('');
+        setMessages(prev => [...prev, { role: 'user', text: userMsg }]);
+        setLoading(true);
+        try {
+            const result = await refineDraft({
+                draft,
+                feedback: userMsg,
+                focus,
+                duration_minutes: duration,
+                available_weights: parseWeights(),
+            });
+            setDraft(result);
+            setMessages(prev => [...prev, { role: 'assistant', text: `Updated to "${result.title}" — ${result.exercises.length} exercises, ${result.total_duration_min} min.` }]);
+        } catch {
+            toast.error('Failed to refine session');
+            setMessages(prev => [...prev, { role: 'assistant', text: 'Sorry, refinement failed. Please try again.' }]);
+        } finally {
+            setLoading(false);
+        }
+    };
+
+    const handleAccept = async () => {
+        if (!draft) return;
+        setStep('saving');
+        try {
+            const session = await saveDraft({ draft });
+            onSaved(session);
+        } catch {
+            toast.error('Failed to save session');
+            setStep('review');
+        }
+    };
+
+    return (
+        <Dialog open={open} onClose={onClose} size="4xl">
+            {step === 'configure' && (
+                <>
+                    <DialogTitle>Create Routine</DialogTitle>
+                    <DialogBody>
+                        <form onSubmit={handleGenerate} className="space-y-4">
+                            <Field>
+                                <Label>Focus</Label>
+                                <div className="flex flex-wrap gap-2">
+                                    {FOCUS_OPTIONS.map(f => (
+                                        <button
+                                            key={f}
+                                            type="button"
+                                            onClick={() => setFocus(f)}
+                                            className={`px-4 py-2 rounded-lg text-sm font-medium border transition-colors ${focus === f
+                                                ? 'bg-primary text-white border-primary'
+                                                : 'bg-base border-border text-content hover:bg-base/80'
+                                                }`}
+                                        >
+                                            {f.charAt(0).toUpperCase() + f.slice(1)}
+                                        </button>
+                                    ))}
+                                </div>
+                            </Field>
+                            <Field>
+                                <Label>Duration (minutes)</Label>
+                                <div className="flex gap-2">
+                                    {DURATION_OPTIONS.map(d => (
+                                        <button
+                                            key={d}
+                                            type="button"
+                                            onClick={() => setDuration(d)}
+                                            className={`flex-1 py-2 rounded-lg text-sm font-medium border transition-colors ${duration === d
+                                                ? 'bg-primary text-white border-primary'
+                                                : 'bg-base border-border text-content hover:bg-base/80'
+                                                }`}
+                                        >
+                                            {d}m
+                                        </button>
+                                    ))}
+                                </div>
+                            </Field>
+                            <Field>
+                                <Label>Available Weights (kg, comma-separated)</Label>
+                                <Input
+                                    type="text"
+                                    placeholder="e.g. 16, 24, 32"
+                                    value={weightsInput}
+                                    onChange={e => setWeightsInput(e.target.value)}
+                                />
+                            </Field>
+                            <div className="flex gap-3 pt-2">
+                                <Button type="button" plain onClick={onClose}>Cancel</Button>
+                                <Button type="submit" color="dark/zinc" disabled={loading} className="flex-1">
+                                    {loading ? 'Generating...' : 'Generate Routine'}
+                                </Button>
+                            </div>
+                        </form>
+                    </DialogBody>
+                </>
+            )}
+
+            {step === 'review' && draft && (
+                <>
+                    <div className="flex items-center justify-between mb-4">
+                        <DialogTitle>{draft.title}</DialogTitle>
+                        <span className="text-xs px-2 py-1 rounded-full bg-zinc-100 dark:bg-zinc-800 text-content-muted capitalize">
+                            {draft.difficulty} · {draft.focus} · {draft.total_duration_min}min
+                        </span>
+                    </div>
+                    <DialogBody>
+                        <div className="flex flex-col gap-4 max-h-[60vh] overflow-y-auto">
+                            {/* Exercise list */}
+                            <div className="space-y-3">
+                                {draft.exercises.map((ex, i) => (
+                                    <div key={i} className="p-3 bg-base rounded-xl border border-border">
+                                        <div className="flex items-start justify-between">
+                                            <div>
+                                                <p className="font-bold text-content text-sm">{ex.order}. {ex.name}</p>
+                                                <p className="text-xs text-content-muted">{ex.description}</p>
+                                            </div>
+                                            <div className="text-right text-xs text-content-muted shrink-0 ml-3">
+                                                <p>{ex.sets} x {ex.reps > 0 ? `${ex.reps} reps` : `${ex.duration_seconds}s`}</p>
+                                                <p>{ex.weight_kg} kg · {ex.rest_seconds}s rest</p>
+                                            </div>
+                                        </div>
+                                        <p className="text-xs text-primary mt-1 italic">"{ex.coaching_tip}"</p>
+                                    </div>
+                                ))}
+                            </div>
+
+                            {draft.notes && (
+                                <p className="text-sm text-content-muted italic">{draft.notes}</p>
+                            )}
+
+                            {/* Chat area */}
+                            <div className="border-t border-border pt-3">
+                                <p className="text-xs text-content-muted mb-2">Refine your routine — tell the AI what to change:</p>
+                                <div className="space-y-2 max-h-40 overflow-y-auto mb-3">
+                                    {messages.map((msg, i) => (
+                                        <div key={i} className={`text-sm px-3 py-2 rounded-xl max-w-[85%] ${msg.role === 'user'
+                                            ? 'bg-primary text-white ml-auto'
+                                            : 'bg-zinc-100 dark:bg-zinc-800 text-content'
+                                            }`}>
+                                            {msg.text}
+                                        </div>
+                                    ))}
+                                    <div ref={chatEndRef} />
+                                </div>
+                                <form onSubmit={handleRefine} className="flex gap-2">
+                                    <Input
+                                        type="text"
+                                        placeholder="e.g. Make it harder, swap exercise 3..."
+                                        value={feedback}
+                                        onChange={e => setFeedback(e.target.value)}
+                                        disabled={loading}
+                                        className="flex-1"
+                                    />
+                                    <Button type="submit" outline disabled={loading || !feedback.trim()}>
+                                        {loading ? '...' : 'Refine'}
+                                    </Button>
+                                </form>
+                            </div>
+                        </div>
+
+                        <div className="flex gap-3 pt-4">
+                            <Button type="button" plain onClick={() => setStep('configure')}>Back</Button>
+                            <Button type="button" color="dark/zinc" className="flex-1" onClick={handleAccept} disabled={loading}>
+                                Accept Routine
+                            </Button>
+                        </div>
+                    </DialogBody>
+                </>
+            )}
+
+            {step === 'saving' && (
+                <DialogBody>
+                    <div className="flex items-center justify-center py-12">
+                        <p className="text-content-muted">Saving routine...</p>
+                    </div>
+                </DialogBody>
+            )}
+        </Dialog>
+    );
+}

frontend/src/components/kettlebell/SetLogger.tsx

@@ -11,34 +11,36 @@ interface SetLoggerProps {
     onComplete: () => void;
 }
 
-function Stepper({ label, value, onChange, step = 1, min = 0 }: {
+function Slider({ label, value, onChange, min, max, step = 1, unit }: {
     label: string;
     value: number;
     onChange: (v: number) => void;
+    min: number;
+    max: number;
     step?: number;
-    min?: number;
+    unit?: string;
 }) {
     return (
-        <div className="flex items-center justify-between gap-4">
-            <span className="text-content-muted w-24">{label}</span>
-            <div className="flex items-center gap-3">
-                <button
-                    type="button"
-                    onClick={() => onChange(Math.max(min, value - step))}
-                    className="w-10 h-10 rounded-full bg-surface border border-border text-xl font-bold text-content flex items-center justify-center active:scale-95"
-                >
-                    −
-                </button>
-                <span className="w-14 text-center text-xl font-bold text-content tabular-nums">
-                    {value}
+        <div className="flex flex-col gap-2">
+            <div className="flex items-center justify-between">
+                <span className="text-content-muted text-sm">{label}</span>
+                <span className="text-2xl font-bold text-content tabular-nums">
+                    {value}{unit && <span className="text-sm font-normal text-content-muted ml-1">{unit}</span>}
                 </span>
-                <button
-                    type="button"
-                    onClick={() => onChange(value + step)}
-                    className="w-10 h-10 rounded-full bg-surface border border-border text-xl font-bold text-content flex items-center justify-center active:scale-95"
-                >
-                    +
-                </button>
+            </div>
+            <input
+                type="range"
+                min={min}
+                max={max}
+                step={step}
+                value={value}
+                onChange={e => onChange(Number(e.target.value))}
+                className="w-full h-2 rounded-full appearance-none cursor-pointer bg-zinc-200 dark:bg-zinc-700 accent-primary
+                    [&::-webkit-slider-thumb]:appearance-none [&::-webkit-slider-thumb]:w-11 [&::-webkit-slider-thumb]:h-11 [&::-webkit-slider-thumb]:rounded-full [&::-webkit-slider-thumb]:bg-primary [&::-webkit-slider-thumb]:shadow-lg [&::-webkit-slider-thumb]:active:scale-110 [&::-webkit-slider-thumb]:transition-transform"
+            />
+            <div className="flex justify-between text-xs text-content-muted">
+                <span>{min}</span>
+                <span>{max}</span>
             </div>
         </div>
     );
@@ -46,22 +48,24 @@ function Stepper({ label, value, onChange, step = 1, min = 0 }: {
 
 function RpeDots({ value, onChange }: { value: number; onChange: (v: number) => void }) {
     return (
-        <div className="flex items-center justify-between gap-4">
-            <span className="text-content-muted w-24">Effort</span>
+        <div className="flex flex-col gap-2">
+            <div className="flex items-center justify-between">
+                <span className="text-content-muted text-sm">Effort</span>
+                <span className="text-2xl font-bold text-content tabular-nums">{value}<span className="text-sm font-normal text-content-muted">/10</span></span>
+            </div>
             <div className="flex items-center gap-1.5">
                 {Array.from({ length: 10 }, (_, i) => i + 1).map((dot) => (
                     <button
                         key={dot}
                         type="button"
                         onClick={() => onChange(dot)}
-                        className={`w-6 h-6 rounded-full transition-colors ${dot <= value
+                        className={`flex-1 h-8 rounded-full transition-colors ${dot <= value
                             ? 'bg-primary'
                             : 'bg-zinc-200 dark:bg-zinc-700'
                             }`}
                         aria-label={`RPE ${dot}`}
                     />
                 ))}
-                <span className="ml-2 text-sm text-content-muted tabular-nums">{value}/10</span>
             </div>
         </div>
     );
@@ -82,11 +86,11 @@ export function SetLogger({
     return (
         <div className="flex flex-col gap-6 px-6 py-4">
             {isTimed ? (
-                <Stepper label="Duration (s)" value={reps} onChange={onRepsChange} step={5} />
+                <Slider label="Duration" value={reps} onChange={onRepsChange} min={5} max={300} step={5} unit="s" />
             ) : (
-                <Stepper label="Reps done" value={reps} onChange={onRepsChange} />
+                <Slider label="Reps" value={reps} onChange={onRepsChange} min={1} max={50} />
             )}
-            <Stepper label="Weight (kg)" value={weightKg} onChange={onWeightChange} step={0.5} />
+            <Slider label="Weight" value={weightKg} onChange={onWeightChange} min={0} max={Math.max(80, Math.ceil(exercise.weight_kg * 1.5))} step={1} unit="kg" />
             <RpeDots value={effort} onChange={onEffortChange} />
 
             <button

frontend/src/pages/ActiveSession.tsx

@@ -19,11 +19,13 @@ interface LastSetStats {
     effort: number;
 }
 
+type UserOverrides = Record<number, { reps?: number; weightKg?: number }>;
+
 type SessionPhase =
     | { phase: 'loading' }
     | { phase: 'planning'; session: KettlebellSession }
-    | { phase: 'active'; session: KettlebellSession; exerciseIdx: number; setIdx: number; elapsed: number; setElapsed: number; lastSetStats: LastSetStats | null; logged: KettlebellSetLog[]; reps: number; weightKg: number; effort: number }
-    | { phase: 'resting'; session: KettlebellSession; exerciseIdx: number; nextSetIdx: number; restRemaining: number; totalRest: number; elapsed: number; pendingSet: { duration: number; reps: number; weightKg: number; effort: number }; logged: KettlebellSetLog[] }
+    | { phase: 'active'; session: KettlebellSession; exerciseIdx: number; setIdx: number; elapsed: number; setElapsed: number; lastSetStats: LastSetStats | null; logged: KettlebellSetLog[]; reps: number; weightKg: number; effort: number; userOverrides: UserOverrides; paused: boolean }
+    | { phase: 'resting'; session: KettlebellSession; exerciseIdx: number; nextSetIdx: number; restRemaining: number; totalRest: number; elapsed: number; pendingSet: { duration: number; reps: number; weightKg: number; effort: number }; logged: KettlebellSetLog[]; userOverrides: UserOverrides; paused: boolean }
     | { phase: 'complete'; session: KettlebellSession; totalElapsed: number; logged: KettlebellSetLog[] };
 
 type Action =
@@ -36,6 +38,7 @@ type Action =
     | { type: 'SET_EFFORT'; value: number }
     | { type: 'COMPLETE_SET'; log: KettlebellSetLog }
     | { type: 'SKIP_REST' }
+    | { type: 'TOGGLE_PAUSE' }
     | { type: 'FINISH' };
 
 function getExercises(session: KettlebellSession): ExerciseBlock[] {
@@ -50,6 +53,17 @@ function initialSetValues(exercise: ExerciseBlock) {
     };
 }
 
+function setValuesWithOverrides(exercise: ExerciseBlock, exerciseIdx: number, overrides: UserOverrides) {
+    const base = initialSetValues(exercise);
+    const o = overrides[exerciseIdx];
+    if (!o) return base;
+    return {
+        reps: o.reps ?? base.reps,
+        weightKg: o.weightKg ?? base.weightKg,
+        effort: base.effort,
+    };
+}
+
 function reducer(state: SessionPhase, action: Action): SessionPhase {
     switch (action.type) {
         case 'LOAD': {
@@ -78,6 +92,8 @@ function reducer(state: SessionPhase, action: Action): SessionPhase {
                             return {
                                 phase: 'active', session, exerciseIdx, setIdx, elapsed, setElapsed: 0, lastSetStats: null, logged: existingLogs,
                                 ...initialSetValues(ex),
+                                userOverrides: {},
+                                paused: false,
                             };
                         }
                     }
@@ -102,28 +118,38 @@ function reducer(state: SessionPhase, action: Action): SessionPhase {
                 lastSetStats: null,
                 logged: [],
                 ...initialSetValues(ex),
+                userOverrides: {},
+                paused: false,
             };
         }
         case 'TICK_ELAPSED': {
-            if (state.phase === 'active') return { ...state, elapsed: state.elapsed + 1, setElapsed: state.setElapsed + 1 };
-            if (state.phase === 'resting') return { ...state, elapsed: state.elapsed + 1 };
+            if (state.phase === 'active' && !state.paused) return { ...state, elapsed: state.elapsed + 1, setElapsed: state.setElapsed + 1 };
+            if (state.phase === 'resting' && !state.paused) return { ...state, elapsed: state.elapsed + 1 };
             return state;
         }
         case 'TICK_REST': {
-            if (state.phase !== 'resting') return state;
+            if (state.phase !== 'resting' || state.paused) return state;
             if (state.restRemaining <= 1) {
                 // Auto-advance to next set
                 return advanceAfterRest(state);
             }
             return { ...state, restRemaining: state.restRemaining - 1 };
         }
+        case 'TOGGLE_PAUSE': {
+            if (state.phase === 'active' || state.phase === 'resting') {
+                return { ...state, paused: !state.paused };
+            }
+            return state;
+        }
         case 'SET_REPS': {
             if (state.phase !== 'active') return state;
-            return { ...state, reps: action.value };
+            const repsOverrides = { ...state.userOverrides, [state.exerciseIdx]: { ...state.userOverrides[state.exerciseIdx], reps: action.value } };
+            return { ...state, reps: action.value, userOverrides: repsOverrides };
         }
         case 'SET_WEIGHT': {
             if (state.phase !== 'active') return state;
-            return { ...state, weightKg: action.value };
+            const weightOverrides = { ...state.userOverrides, [state.exerciseIdx]: { ...state.userOverrides[state.exerciseIdx], weightKg: action.value } };
+            return { ...state, weightKg: action.value, userOverrides: weightOverrides };
         }
         case 'SET_EFFORT': {
             if (state.phase !== 'active') return state;
@@ -163,6 +189,8 @@ function reducer(state: SessionPhase, action: Action): SessionPhase {
                     elapsed: state.elapsed,
                     pendingSet,
                     logged: newLogged,
+                    userOverrides: state.userOverrides,
+                    paused: false,
                 };
             }
             return advanceFromActive(state, newLogged, { ...pendingSet, restTaken: null });
@@ -182,11 +210,12 @@ function advanceFromActive(state: Extract<SessionPhase, { phase: 'active' }>, ne
     const exercises = getExercises(state.session);
     const exercise = exercises[state.exerciseIdx];
     if (state.setIdx + 1 < exercise.sets) {
-        return { ...state, setIdx: state.setIdx + 1, setElapsed: 0, lastSetStats, logged: newLogged, ...initialSetValues(exercise) };
+        return { ...state, setIdx: state.setIdx + 1, setElapsed: 0, lastSetStats, logged: newLogged, ...setValuesWithOverrides(exercise, state.exerciseIdx, state.userOverrides) };
     }
     if (state.exerciseIdx + 1 < exercises.length) {
-        const nextEx = exercises[state.exerciseIdx + 1];
-        return { ...state, exerciseIdx: state.exerciseIdx + 1, setIdx: 0, setElapsed: 0, lastSetStats, logged: newLogged, ...initialSetValues(nextEx) };
+        const nextIdx = state.exerciseIdx + 1;
+        const nextEx = exercises[nextIdx];
+        return { ...state, exerciseIdx: nextIdx, setIdx: 0, setElapsed: 0, lastSetStats, logged: newLogged, ...setValuesWithOverrides(nextEx, nextIdx, state.userOverrides) };
     }
     return { phase: 'complete', session: state.session, totalElapsed: state.elapsed, logged: newLogged };
 }
@@ -206,21 +235,26 @@ function advanceAfterRest(state: Extract<SessionPhase, { phase: 'resting' }>): S
             setElapsed: 0,
             lastSetStats,
             logged: state.logged,
-            ...initialSetValues(exercise),
+            ...setValuesWithOverrides(exercise, state.exerciseIdx, state.userOverrides),
+            userOverrides: state.userOverrides,
+            paused: false,
         };
     }
     if (state.exerciseIdx + 1 < exercises.length) {
-        const nextEx = exercises[state.exerciseIdx + 1];
+        const nextIdx = state.exerciseIdx + 1;
+        const nextEx = exercises[nextIdx];
         return {
             phase: 'active',
             session: state.session,
-            exerciseIdx: state.exerciseIdx + 1,
+            exerciseIdx: nextIdx,
             setIdx: 0,
             elapsed: state.elapsed,
             setElapsed: 0,
             lastSetStats,
             logged: state.logged,
-            ...initialSetValues(nextEx),
+            ...setValuesWithOverrides(nextEx, nextIdx, state.userOverrides),
+            userOverrides: state.userOverrides,
+            paused: false,
         };
     }
     return { phase: 'complete', session: state.session, totalElapsed: state.elapsed, logged: state.logged };
@@ -292,6 +326,9 @@ export default function ActiveSession() {
     }, [id, state]);
 
     const [showAbandonModal, setShowAbandonModal] = useState(false);
+    const [showBackModal, setShowBackModal] = useState(false);
+
+    const handleTogglePause = useCallback(() => dispatch({ type: 'TOGGLE_PAUSE' }), []);
 
     const handleAbandon = useCallback(async () => {
         if (!id) return;
@@ -368,10 +405,19 @@ export default function ActiveSession() {
                         onCancel={() => setShowAbandonModal(false)}
                     />
                 )}
+                {showBackModal && (
+                    <ConfirmModal
+                        title="Leave Session"
+                        message="Session will be paused. You can resume later from the Kettlebell page."
+                        confirmLabel="Leave"
+                        onConfirm={() => navigate('/kettlebell')}
+                        onCancel={() => setShowBackModal(false)}
+                    />
+                )}
 
                 {/* Sticky top bar */}
                 <div className="flex items-center justify-between px-4 py-3 border-b border-border bg-surface sticky top-0 z-10">
-                    <button onClick={() => navigate('/kettlebell')} className="text-content-muted hover:text-content text-sm">
+                    <button onClick={() => setShowBackModal(true)} className="text-content-muted hover:text-content text-sm">
                         ← Back
                     </button>
                     <ProgressBar
@@ -425,7 +471,7 @@ export default function ActiveSession() {
                         )}
                     </div>
 
-                    <ElapsedTimerCircle seconds={state.setElapsed} />
+                    <ElapsedTimerCircle seconds={state.setElapsed} paused={state.paused} onClick={handleTogglePause} />
 
                     {/* Total */}
                     <div className="flex-1 flex flex-col items-end gap-1.5">
@@ -484,9 +530,18 @@ export default function ActiveSession() {
                         onCancel={() => setShowAbandonModal(false)}
                     />
                 )}
+                {showBackModal && (
+                    <ConfirmModal
+                        title="Leave Session"
+                        message="Session will be paused. You can resume later from the Kettlebell page."
+                        confirmLabel="Leave"
+                        onConfirm={() => navigate('/kettlebell')}
+                        onCancel={() => setShowBackModal(false)}
+                    />
+                )}
 
                 <div className="flex items-center justify-between w-full max-w-sm">
-                    <button onClick={() => navigate('/kettlebell')} className="text-content-muted hover:text-content text-sm">
+                    <button onClick={() => setShowBackModal(true)} className="text-content-muted hover:text-content text-sm">
                         ← Back
                     </button>
                     <div className="text-lg font-mono font-bold text-content">
@@ -494,8 +549,8 @@ export default function ActiveSession() {
                     </div>
                 </div>
 
-                <h2 className="text-3xl font-bold text-content">REST</h2>
-                <RestCountdown remaining={state.restRemaining} total={state.totalRest} />
+                <h2 className="text-3xl font-bold text-content">{state.paused ? 'PAUSED' : 'REST'}</h2>
+                <RestCountdown remaining={state.restRemaining} total={state.totalRest} paused={state.paused} onClick={handleTogglePause} />
                 <p className="text-content-muted text-sm text-center">{nextLabel}</p>
 
                 <button

frontend/src/pages/Kettlebell.tsx

@@ -1,18 +1,14 @@
-import { useState, useEffect, FormEvent } from 'react';
+import { useState, useEffect } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { toast } from 'sonner';
-import { generateSession, getSessions, deleteSession, retrySession } from '../api/kettlebell';
+import { getSessions, deleteSession, retrySession } from '../api/kettlebell';
 import type { KettlebellSession } from '../types/kettlebell';
 import { Heading, Subheading } from '../components/catalyst/heading';
 import { Button } from '../components/catalyst/button';
-import { Field, Label } from '../components/catalyst/fieldset';
-import { Input } from '../components/catalyst/input';
 import { ConfirmModal } from '../components/ConfirmModal';
+import { RoutineWizard } from '../components/kettlebell/RoutineWizard';
 import { BarChart2 } from 'lucide-react';
 
-const FOCUS_OPTIONS = ['strength', 'conditioning', 'fat loss', 'mobility', 'endurance'];
-const DURATION_OPTIONS = [20, 30, 45, 60];
-
 const statusColors: Record<string, string> = {
     generated: 'bg-zinc-100 text-zinc-600 dark:bg-zinc-800 dark:text-zinc-300',
     in_progress: 'bg-blue-100 text-blue-700 dark:bg-blue-900 dark:text-blue-200',
@@ -24,12 +20,8 @@ export default function Kettlebell() {
     const navigate = useNavigate();
     const [sessions, setSessions] = useState<KettlebellSession[]>([]);
     const [selected, setSelected] = useState<KettlebellSession | null>(null);
-    const [loading, setLoading] = useState(false);
     const [deleteTarget, setDeleteTarget] = useState<KettlebellSession | null>(null);
-
-    const [focus, setFocus] = useState('strength');
-    const [duration, setDuration] = useState(30);
-    const [weightsInput, setWeightsInput] = useState('16, 24, 32');
+    const [showWizard, setShowWizard] = useState(false);
 
     useEffect(() => {
         getSessions().then(data => {
@@ -62,22 +54,10 @@ export default function Kettlebell() {
         }
     };
 
-    const handleGenerate = async (e: FormEvent) => {
-        e.preventDefault();
-        setLoading(true);
-        try {
-            const available_weights = weightsInput
-                .split(',')
-                .map(s => parseFloat(s.trim()))
-                .filter(n => !isNaN(n) && n > 0);
-            const session = await generateSession({ focus, duration_minutes: duration, available_weights });
-            setSessions(prev => [session, ...prev]);
-            setSelected(session);
-        } catch {
-            toast.error('Failed to generate session');
-        } finally {
-            setLoading(false);
-        }
+    const handleWizardSaved = (session: KettlebellSession) => {
+        setSessions(prev => [session, ...prev]);
+        setSelected(session);
+        setShowWizard(false);
     };
 
     const exercises = selected?.exercises?.exercises ?? [];
@@ -105,52 +85,19 @@ export default function Kettlebell() {
                 {/* Left Column */}
                 <div className="space-y-6 lg:col-span-1">
                     <div className="bg-surface p-6 rounded-2xl shadow-sm border border-border">
-                        <Subheading className="mb-6 text-primary">Generate Session</Subheading>
-                        <form onSubmit={handleGenerate} className="space-y-4">
-                            <Field>
-                                <Label>Focus</Label>
-                                <select
-                                    value={focus}
-                                    onChange={e => setFocus(e.target.value)}
-                                    className="w-full rounded-lg border border-border bg-base text-content px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-primary"
-                                >
-                                    {FOCUS_OPTIONS.map(f => (
-                                        <option key={f} value={f}>{f.charAt(0).toUpperCase() + f.slice(1)}</option>
-                                    ))}
-                                </select>
-                            </Field>
-                            <Field>
-                                <Label>Duration (minutes)</Label>
-                                <div className="flex gap-2">
-                                    {DURATION_OPTIONS.map(d => (
-                                        <button
-                                            key={d}
-                                            type="button"
-                                            onClick={() => setDuration(d)}
-                                            className={`flex-1 py-2 rounded-lg text-sm font-medium border transition-colors ${duration === d
-                                                ? 'bg-primary text-white border-primary'
-                                                : 'bg-base border-border text-content hover:bg-base/80'
-                                                }`}
-                                        >
-                                            {d}m
-                                        </button>
-                                    ))}
-                                </div>
-                            </Field>
-                            <Field>
-                                <Label>Available Weights (kg, comma-separated)</Label>
-                                <Input
-                                    type="text"
-                                    placeholder="e.g. 16, 24, 32"
-                                    value={weightsInput}
-                                    onChange={e => setWeightsInput(e.target.value)}
-                                />
-                            </Field>
-                            <Button type="submit" color="dark/zinc" disabled={loading} className="w-full">
-                                {loading ? 'Generating...' : 'Generate Session'}
-                            </Button>
-                        </form>
+                        <Subheading className="mb-4 text-primary">Generate Session</Subheading>
+                        <p className="text-sm text-content-muted mb-4">
+                            Create an AI-powered kettlebell routine. You can refine it until it's exactly what you want.
+                        </p>
+                        <Button color="dark/zinc" className="w-full" onClick={() => setShowWizard(true)}>
+                            Create Routine
+                        </Button>
                     </div>
+                    <RoutineWizard
+                        open={showWizard}
+                        onClose={() => setShowWizard(false)}
+                        onSaved={handleWizardSaved}
+                    />
 
                     <div className="bg-surface p-6 rounded-2xl shadow-sm border border-border h-96 overflow-y-auto">
                         <Subheading className="mb-4">History</Subheading>

frontend/src/types/kettlebell.ts

@@ -25,6 +25,15 @@ export interface KettlebellSession {
     created_at: string;
 }
 
+export interface DraftSession {
+    title: string;
+    focus: string;
+    total_duration_min: number;
+    difficulty: string;
+    exercises: ExerciseBlock[];
+    notes: string;
+}
+
 export interface KettlebellSetLog {
     id: number;
     session_id: number;