You choose which health permissions Fitness Connected can use, who can see health data on your profile, and which people or groups you participate with. Mutual Connections visibility and group sharing follow those choices rather than overriding them.
Source health data remains in Apple Health or Health Connect. Fitness Connected reads supported data you allow. Deleting your Fitness Connected account removes or de-identifies Fitness Connected-stored data according to the Privacy Policy, and does not delete source data from those health platforms.
Your choices stay yours
Review permissions, profile visibility, connections, groups, and account deletion whenever your needs change.