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42

42-Day Fitness Challenge

Build a life-changing habit in 42 days.
Track every workout. Watch your score climb.

Download on the App Store
Get it on Google Play

See it in action

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Everything you need

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Apple HealthKit

Sync with Apple Health to pull in your activity data. Your workouts stay connected across apps.

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Step Tracking

Daily steps imported automatically from HealthKit. See how your movement adds up alongside workouts.

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GPS Tracking

Track distance in real time for runs, rides and walks. Route recorded in the background.

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Fitness Score

A 0โ€“100 score built from consistency, effort and volume. Level up from Beginner to Elite.

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11 Achievements

Unlock badges as you hit milestones โ€” First Sweat, Halfway There, 42-Day Champion and more.

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Calendar View

See every workout and rest day at a glance. Teal dots for workouts, purple for recovery.

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Progress Chart

Watch your fitness score arc across all 42 days. The line going up never gets old.

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Daily Reminders

Pick your reminder time. The app nudges you so you never miss a day.

Why 42 days?

Research shows it takes 42 days โ€” 6 full weeks โ€” to build a habit that actually sticks. Not 21 days. Not 30. 42. Enough time to make exercise feel automatic, not forced.

Start your transformation

Free ยท No account required ยท All data stays on your device

Download on the App Store
Get it on Google Play