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The Apple Watch app is part of MuscleMommy Pro. Install MuscleMommy on the watch from the Watch app on your iPhone, open it once, then start the workout on your iPhone. The watch follows the phone.

Open Settings › Health › Data Access & Devices › MuscleMommy and allow Heart Rate and Active Energy. Heart rate needs the watch app to be recording the workout.

Allow MuscleMommy to write Workouts in Settings › Health › Data Access & Devices. Workouts are saved when you tap Save on the Finish sheet.

Tap the set again. Each tap takes off a rep, and after zero it goes back to untouched. Nothing is final until you tap Save.

Tap the weight, set the right one, and choose Also set as working weight.

Hit every rep of every set and the weight goes up next time by the exercise's increment. Fail three sessions in a row and it drops by 10%.

Swipe the exercise right to skip it today, or left to swap it for another one for this session only.

In the app, open Settings › MuscleMommy Pro › Restore Purchases. Use the same Apple ID you bought Pro with.

Open the Settings app on your iPhone, tap your name, then Subscriptions › MuscleMommy. You keep Pro until the end of the period you paid for.

Refunds are handled by Apple. Request one at reportaproblem.apple.com.

Nothing is deleted. Your workouts, history and custom programs and exercises keep working; only creating new custom ones needs Pro. Themes go back to Pink, and your chosen theme comes back if you subscribe again. A workout in progress always finishes normally.

Yes. MuscleMommy Pro supports Family Sharing, so up to five family members can use it with their own Apple IDs.

In Settings, tap Export all data as JSON. It creates one file with all your programs and workouts. Save it to Files or anywhere you like.

No. There are no accounts. Your data lives on your iPhone.