Hey,
A few small niggles I have with the app.
The HR graph activating inadvertently. Slight movement into landscape will knock you out of whatever screen you are on and you will lose progress in coach chats etc. I find this frustrating and an option to disable or a specific button to view the graph would be good.
Changing times on workouts - when doing this, the only option is scrolling the time. On occasion the user swipes down in the wrong place closing/cancelling the edit and losing progress. Again frustrating.