Fastlance is a powerful interval timer app for HIIT, Tabata, and circuit training. Simple, fast, and effective - get into your workout in seconds with precise timing and motivating feedback.

🏋️ 6 PRE-BUILT WORKOUTS
Ready-to-use interval templates:
- Quick HIIT - 20s work / 10s rest, 8 rounds (4 min)
- Tabata Classic - 20s work / 10s rest, 8 rounds (4 min)
- Power Circuit - 45s work / 15s rest, 10 rounds (10 min)
- Cardio Blast - 30s work / 30s rest, 12 rounds (12 min)
- Strength Focus - 60s work / 30s rest, 6 rounds (9 min)
- Sprint Training - 15s work / 5s rest, 12 rounds (4 min)

⚙️ CUSTOM TIMER
Create your own intervals:
- Set work time: 5-300 seconds
- Set rest time: 5-300 seconds
- Set rounds: 1-50
- Quick preset buttons (20/10, 30/30, 45/15, 60/30)
- Instant validation and start

⏱️ PROFESSIONAL TIMER
- Large countdown display (minutes:seconds)
- Clear work/rest phase indicators
- Round counter (Round X of Y)
- Start/Pause/Resume controls
- Reset anytime
- Automatic phase transitions

📊 PROGRESS TRACKING
- Total workouts completed counter
- Total training minutes accumulated
- Daily streak tracker (consecutive days)
- Auto-save after each workout
- Persistent statistics (survives app restart)
- Visual stats display with emojis

🎯 ONE-TAP START
Every workout starts with a single tap:
1. Choose a preset workout OR create custom
2. Tap "START WORKOUT" button
3. Timer begins countdown immediately
4. Audio and vibration guide you through
5. Statistics update automatically when done

✨ KEY FEATURES
- 6 ready-to-use workout templates
- Unlimited custom timer creation
- Real countdown timer (updates every second)
- Work phase → Rest phase → automatic transitions
- Round counter with progress display
- Pause and resume anytime
- Complete workout dialog with summary
- Streak system for motivation
- Sound beeps and vibration patterns
- No ads, no subscriptions, no login
- Works 100% offline
- No data collection
- Modern, clean interface
- Orange and blue theme
- Status bar color matching

💪 PERFECT FOR
- HIIT (High-Intensity Interval Training)
- Tabata protocol workouts
- Circuit training sessions
- Boxing and MMA rounds
- CrossFit WODs
- Cardio intervals
- Sprint training
- Strength training
- Bodyweight exercises
- Home workouts
- Gym training
- Outdoor fitness

🔥 HOW IT WORKS
The timer runs through your selected intervals:
1. WORK phase - exercise time (timer counts down)
2. REST phase - recovery time (automatic transition)
3. Repeat for the number of rounds you chose
4. COMPLETE - dialog shows summary, stats update

During workout:
- "WORK TIME!" - green border, timer counting down
- "REST TIME" - blue border, recovery countdown
- Beep sounds at 3, 2, 1 seconds
- Vibration on every phase change
- Pause button to take breaks
- Reset button to start over

📱 TECHNICAL
- Minimum Android 5.0 (API 21)
- Target Android 14 (API 34)
- Single Activity architecture
- Handler-based precise timing
- SharedPreferences for data storage
- ToneGenerator for beep sounds
- Vibrator for haptic feedback
- No external dependencies
- Battery efficient
- Small app size

🔒 PRIVACY
Your data stays on your device:
- No internet connection required
- No account registration
- No cloud sync
- No data collection
- No analytics or tracking
- All stats stored locally
- Safe for all ages

⚠️ IMPORTANT
- Only requires VIBRATE permission (for haptic feedback)
- Timer continues if you minimize the app
- Statistics are saved automatically after each workout
- Streak resets if you skip a day
- Custom timer validates input (prevents errors)

Perfect for anyone who wants effective interval training with professional timing and progress tracking.