Fartlek Interval Trainer

iPhone / Forme et santé

Fartlek Interval Trainer has been completely rebuilt for 2026 with a beautiful new Liquid Glass interface.

The original auto-detect app for spontaneous interval training now displays your progress live, with colour-coded feedback showing when you’re running hard and when you’re resting.

Simply launch Fartlek mode to start your workout. Run freely and change pace spontaneously — FiT detects your speed in real time, automatically converting your run into structured segments that show your effort across the workout.

No reaching for your device.
No pressing buttons.
Just automatic recording of your activity.

Full health and activity metrics are recorded at both interval and workout level and are available in your workout history. View pace, heart rate, calories, cadence, and distance for each segment, with automatic syncing to Apple Health.

Prefer structure? FiT also supports classic interval training for HIIT, Tabata, and more.

Put your phone away.
Trust your instincts.
Let the app do the rest.

Happy fartlekking!


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

Quoi de neuf dans la dernière version ?

Version 2.0.2
New! Added support for music and other audio during workouts.

Version 2.0.1
New! Ability to search and sort previous workouts added.

Version 2.0.0
Completely rebuilt for 2026.

• Brand-new Liquid Glass interface across iPhone and Apple Watch
• New Dual Ring Progress View showing interval and workout progress at a glance
• Live, colour-coded interval feedback while you run
• All-new workout history with full per-interval health metrics
• A redesigned interval engine for more accurate auto-detection and recording