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Crucible Fit

A daily functional fitness test for iPhone and Apple Watch. Stations, reps and the Crux, sized to your readiness and your kit.

Download on the App Store

Crucible Fit is coming to Android

Today it's on iPhone and Apple Watch.

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Crucible Fit

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CRUCIBLE FIT™ and Crux by Crucible Fit are trademarks of Crucible Fit, LLC.

© 2026 Crucible Fit, LLC. All rights reserved. Apple, the Apple logo, iPhone and Apple Watch are trademarks of Apple Inc., registered in the U.S. and other countries. App Store is a service mark of Apple Inc.

The ranked week

A Crucible every day. One a week is ranked.

Today's Crucible is sized to your recovery, every day. On top of that, each week has a ranked Crucible for your division: everyone runs the same one, exactly as written, so a gym, a club or a group of friends can make it their weekly competition. Your fastest time stands.

On screen

  1. Hold the Crux to the end. Earn the mark.
  2. A Crucible every day. One a week is ranked.
  3. Your splits, ready to share.
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Divisions

You compete against people with the same kit.

Equipment is a division, not a handicap. The kit you own decides which week's Crucible is yours.
  • Bodyweight

    Nothing to own. The floor and the Crux.

  • Dumbbells

    One pair of dumbbells, in one spot.

  • Kettlebells

    The bells you have, in one spot.

The window

Any day that suits you.

Run the week's Crucible any day from Monday 5 am to 2 am Sunday night, local time. Run it again if you like: your fastest time stands.
  1. Monday

    5 am

  2. Saturday

    The field gathers

  3. Sunday night

    2 am

Evidence, not trust

A garage time stands next to anyone's.

Heart rate

Recorded across the attempt by any device that writes to Apple Health: Apple Watch, Garmin, Whoop or a chest strap.

An observer

Someone who watched you run it enters their code.

Without either, the mark still counts in your own record. A solo attempt always counts for you.

Marks and streaks

Consistency you can see.

  • Marks never expire

    A mark records that you finished to standard. It doesn't drop when you sleep badly.

  • Ranked weeks in a row

    The app tracks your streak of ranked weeks, and tells you when a ranked result is on the board.

  • Firsts, named once

    Every station unbroken, a Grade cleared: announced once, when it happens.

The finish ceremony for The Whole Hour: every Crux effort held to the end across 27 efforts, and 7 ranked weeks in a row, the longest so far.

Share

Send it to someone who thinks they can beat it.

The share sheet: a finish image for The Whole Hour at 52:43 with station and Crux time, above a Share button.

A 4:5 image of your finish plus a link that opens the same Crucible in the app, or the install page if they don't have it. Only what's on the image leaves your phone: no location, no health data, no account details. Nothing is sent until you tap Share.

A Crucible every day. One a week is ranked.

Your first Crucible is on us. Then $14.99 a month with a 7-day trial, or $119.99 a year with a 14-day trial.

Download on the App Store

Crucible Fit is coming to Android

Today it's on iPhone and Apple Watch.

Get Crucible