Does MFit work with my watch, Apple Health or Health Connect?
Yes. MFit reads heart rate, HRV, sleep and steps from Apple Health and Health Connect. That data can only make a session easier, never harder. You can disconnect it at any time.
Updated
What is read
Heart rate and resting heart rate, HRV, sleep duration and daily steps.
Those produce a readiness reading. On a poor day the engine lowers the load or proposes rest.
What runs on the watch
On watchOS: today's session, the weekly ring and a live workout screen. The last saved plan still runs when the phone is out of reach.