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Connecting Apple Health or Health Connect
Go to Profile → Health and watch → Apple Health on iPhone, or Health Connect on Android, and tap Connect. You choose what's shared:
Strength workouts are saved to Health when you finish. Weight is imported from Health, and an entry you type yourself always wins. Energy and macros writes each meal you log; it's off until you turn it on.
Imported weight also feeds the nutrition review every two weeks. Stop syncing turns it off without deleting anything; you can revoke access from your phone's settings too.