Which wearables does ProCoach support?

The client connects the source, not the coach. It is their phone and their health data, so the choice and the permission are theirs.

Connecting imports up to the last 30 days, then keeps up as new days arrive.

Any watch or band that writes to Apple Health or Health Connect is covered by those two, which is most of them. WHOOP and Fitbit connect directly.

A client can disconnect at any time, which stops the sync and keeps the history, or delete their health data outright, which removes it from ProCoach.

Health data is never used for advertising and is never sold.