Fartlek Interval Trainer

Build the interval workout you want. Stay on target while you train. Then learn from every session.

FiT is an interval timer and training companion for runners on Apple Watch and iPhone. Create classic intervals, HIIT and Tabata workouts—or run freely with automatic Fartlek interval detection.

CREATE WORKOUTS YOUR WAY

Build simple work-and-rest sessions or advanced workouts with warm-ups, cooldowns, repeated sets and multiple effort levels. FiT makes even complex sessions clear and easy to follow.

STAY ON TARGET

Color-coded feedback shows whether you’re on pace. Spoken coaching, audio and haptic alerts help you respond without constantly checking your device—and spoken cues automatically match your chosen language.

The Dual Progress Ring shows both your current interval and your overall workout progress at a glance.

FARTLEK WITHOUT THE BUTTONS

Switch to Fartlek mode and run by feel. FiT detects changes in your speed and automatically converts them into recorded intervals.

No reaching for your device. No tapping between efforts. Just run.

LEARN FROM EVERY WORKOUT

See how each interval performed with detailed pace, heart rate, cadence and distance metrics.

Compare workouts to understand how your performance changes over time. Personalized coaching insights use your workout data to highlight meaningful patterns and offer practical recommendations for future sessions.

ADVANCED EFFORT TRACKING

Advanced workouts can distinguish between sprint, hard, moderate and easy efforts, helping you create more varied sessions and analyze every effort afterwards.

APPLE WATCH, IPHONE AND YOUR FITNESS APPS

Train in your chosen language on Apple Watch or iPhone. Create and edit interval workouts directly on your watch, with controls for inserting, reordering and deleting interval groups.

Save completed workouts to Apple Health and sync your sessions with Strava.

KEY FEATURES

• Flexible interval timer for running, HIIT and Tabata
• Automatic Fartlek interval detection
• Dual-ring live workout progress
• Color-coded pace and effort feedback
• Localized spoken coaching, plus audio and haptic alerts
• Create and edit interval workouts on Apple Watch
• Detailed pace, heart rate, cadence and distance metrics
• Performance tracking for every interval
• Workout comparisons and personalized insights
• Sprint, hard, moderate and easy effort levels
• Apple Health and Strava integration
• Light and dark appearance

Run free. Train smart. Learn from every session.

SUBSCRIPTION TERMS

FiT offers an optional auto-renewable subscription. Payment will be charged to your Apple ID account at confirmation of purchase. The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. You can manage or cancel your subscription at any time in your Apple ID account settings.

Terms of Use:
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Privacy Policy:
https://www.iubenda.com/privacy-policy/39192677