Run by feel. Follow a plan. Learn from every interval.
FiT — Fartlek Interval Trainer brings flexible interval workouts, automatic Fartlek detection and personalised workout insights to Apple Watch and iPhone. Built by a runner, for runners.
Run freely, without tapping between efforts
Sprint to the next lamppost. Jog until you’re ready. Go again. In Fartlek mode, FiT detects changes in your speed and records your efforts and recoveries as separate intervals. Start your workout, then concentrate on your run.
Build the workout you want
Create classic intervals, HIIT and Tabata sessions, with warm-ups, cooldowns, repeated sets and different effort levels. Create and edit workouts directly on Apple Watch, too.
Stay on track while you train
Live colour-coded feedback, spoken coaching and audio and haptic alerts help you follow your session. The Dual Progress Ring shows your current interval and overall workout progress at a glance.
Understand more than your finishing time
Explore pace, heart rate, cadence and distance for every interval, with interactive charts showing how your session unfolded. Personalised coaching insights help you understand your efforts and recoveries, with practical suggestions for your next run.
FiT Pro adds deeper analysis, including comparisons between matching workouts and running-form trends over time, alongside advanced effort bands for easy, moderate, hard and sprint efforts.
Keep your training connected
Save workouts to Apple Health and sync sessions to Strava. Train in your preferred language, with localised spoken coaching.
Free to download, with optional Pro upgrades.
Run free. Train smart. Learn from every session.
Happy fartlekking!
