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Crucible
Download on the App Store
Crucible

Crucible is a precision strength training system built around your body, your equipment, your location, and your time.

Download on the App Store

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Two athletes sprinting forward together in a dark gym

Precision strength training

Know exactly what to do today.

Crucible turns a goal into a specific workout - built around your muscles, time, equipment, location, and energy. No more becoming your own coach.

Most apps drop you on a blank screen and expect you to coach yourself.

Download on the App Store
See How It Works
  • 5,000+ movements
  • Protocol-based training
  • Apple Health + Apple Watch
  • Your data, exportable
Crucible workout screen showing readiness and muscle group selection
Pick today's focus

Know Exactly What To Do Today: Turn a broad goal into a specific session you can start now.

Goal & muscle group

Total Body, Push, Pull, Arms, Core, and more - start from what you want today.

Duration

Choose how much time you have; the workout fits real life.

Equipment

Workouts reflect the gear you can actually use.

Location

Home, gym, or hotel - the plan adapts to where you train.

Difficulty scaling

Light, Standard, or Push fit high- and low-energy days.

Summary & editing

Review, reorder, replace, and preview before you start.

Training protocols

Circuits, EMOM, AMRAP, supersets, pyramids, ladders, and drop sets.

The plan

How Crucible works

  1. 01

    Set your goal, time, and equipment

    Tell Crucible what you want today and what you have to work with.

  2. 02

    Train in guided flow

    The runner handles sets, timers, rest, and voice cues so you stay present.

  3. 03

    See progress and recover smarter

    History, PRs, and readiness show the work adding up over time.

Athlete mid dumbbell curl with motion-blurred reps in a dark gym

02 · In the session

Stay In Flow While You Train

A focused runner keeps you present while it handles the logistics.

Workout runner

One focused screen: current move, set, rest, and what's next.

Rest timers

Timed rest keeps your pace without watching the clock.

Get-ready countdown

A countdown eases you into every set.

Set tracking

Log weight, reps, and completed work as you go.

Effort / RPE

Capture how hard each set actually felt.

Exercise swap

Swap a movement mid-session without losing your place.

Pause, resume, skip

Real workouts get interrupted; the session bends with you.

Voice cues

Audio guidance so you train without staring at your phone.

Left / right tracking

Guides single-side work so nothing gets missed.

Workout extension

Finished early and strong? Add more work instantly.

Close detail of a lifter's back and shoulders mid-training
Crucible workout history list organized by date
Every session, by date
Crucible strength index with personal records
Strength trending up

03 · Progress

See That You're Actually Improving

Proof the work is adding up - history, PRs, and trends.

Workout history

Every past session, organized by date.

Session details

Exercises, sets, volume, duration, effort, and health metrics.

Session effort score

See how demanding a workout was versus recent training.

Personal records

PRs surface the moment you beat a previous best.

Exercise history

See past performance for any single movement.

Streaks

Consistency you can see and keep.

Weekly pace

Know whether you're ahead of or behind your rhythm.

Totals

Volume, time, and counts add up over time.

Export data

Your full workout record, exportable anytime.

Athlete resting with a towel after training, watch on the wrist

04 · Readiness and recovery

Train With Your Body, Not Against It

Crucible reads sleep, HRV, and workload so training fits your body.

Crucible readiness and recovery scores
Readiness at a glance
Crucible HRV and sleep trends
HRV and sleep trends

Apple Health connection

Reads sleep, HRV, heart rate, resting HR, and workouts.

Training readiness

A score that says push, hold steady, or recover.

Recovery score

Body-state, separate from whether you finished a workout.

HRV trends

Heart-rate variability tracked over time.

Sleep trends

Sleep quality woven into your recovery picture.

Resting heart rate

A simple long-term signal of fitness.

Workload balance

Acute vs chronic load, so you build sustainably.

External workouts

Runs, rides, and yoga count toward your total load.

Strength index

One signal for whether strength is rising or flat.

Athlete training with a smartwatch on the wrist

05 · Apple Watch

Your Wrist Is All You Need

Run the whole session from your wrist.

Workout mirroring

Your phone session, live on your wrist.

Wrist controls

Complete sets, skip, and manage rest from the watch.

Watch timers

Timers and workout state visible at a glance.

Current exercise

Always know the move you're on.

Health integration

Watch and Health data enrich every session.

Hands arranging modular workout blocks

06 · Build and templates

Build Your Own Training System

Create, save, and evolve workouts exactly how you want.

Build from scratch

Create workouts exactly the way you want.

Start from a smart plan

Generate a plan, then make it yours.

Saved workouts

Reuse the sessions you love.

Templates

Repeatable routines that cut the friction.

Template editing

Your routines evolve instead of going stale.

Exercise picker

Search or get recommendations fast.

Suggestions

Smart picks narrow the choices for you.

Progression rules

Templates nudge reps, weight, and difficulty up.

A lifter looking at a rising progression of training phases

07 · Programs

Follow A Program, Not Just A Workout

Train across weeks with structure and purpose.

Multi-week programs

Organize training across weeks, not just days.

Training blocks

Strength, hypertrophy, deload, and testing phases.

Weekly schedule

Follow fixed days that fit your week.

Rotating schedule

Or run rotating A/B/C plans for irregular weeks.

Today's workout

Open the app and the next session is right there.

Program progress

Completed workouts keep the plan in sync with reality.

08 · Preferences

Personalize The App Around Your Life

Tune units, audio, locations, and tracking to fit you.

Units

Pounds or kilos, your call.

Rest time

Set the default rest that suits you.

Fitness level

Tune the baseline to where you are.

Theme

Make the app look the way you like.

Locations

Maintain home, gym, and travel setups.

Equipment

Keep each environment's gear up to date.

Audio preferences

Control voice cues and coach voice.

Set tracking preference

Detailed logging or a lighter-touch experience.

Flat lay of gym gear: bag, dumbbell, watch, shoes, earbuds, band, and notebook

09 · Trust and ownership

Trust, Support, And Ownership

Your training record stays yours, with help when you need it.

Help center

Understand features and troubleshoot fast.

Feedback & support

A human path for help when you need it.

Data export

Your training record is never trapped.

Pro access

Unlimited workouts, protocols, advanced tracking, and Watch.

Sync

Your training stays current across devices.

Family sharing

Share Pro with the people you train with.

Account & security

Your account and data, protected.

Stacked translucent training records

Start training

Train with intention. See it compound.

Open Crucible and know exactly what to do, stay in flow while you train, and watch the progress stack up - while training with your body, not against it.

Download on the App Store
See How It Works