Yosh (app.yosh.coach)
You can delete your Yosh account and everything stored with it at any time. You don't need the app installed: the website works too.
Used Yosh only as a guest? A guest account lives only on that device, so it can't be opened elsewhere. Signing out of it, or uninstalling, removes your access to it.
Your profile, training plans, logged sessions, reviews, meals, weights, fitness tests, Garmin connection, club memberships and notes, and your sign-in account. Nothing is kept afterwards, and Yosh checks that nothing is left before confirming.
To keep your account but clear your history, use Profile → Start fresh instead. To get a copy of your data first, use Profile → Export my data.