This app stores all data locally on your device.
This app does not connect to the internet in any way and your data will be never shared or sent outside of your device.
If you grant read access to Apple's Health app then this app will read your workouts, steps and meditation sessions to calculate your usage time for today.
If you grant write access to Apple's Health app then this app will be able to add new workouts and meditation sessions.
This app cannot read from or write to the Apple Health app unless you give it explicit permission to do so.