How do I connect Apple Health or Health Connect?

Import cardio automatically from your phone's health store, including anything Strava or Garmin writes back to it.

Connecting a health source means cardio you record elsewhere shows up here without being typed in twice.

Go to Profile, then Health sync
On iPhone this reads Apple Health. On Android it reads Health Connect.
Grant read access
Your phone asks which data types Colossus may read. It only ever reads; it does not write to your health store.
On Android, install Health Connect if prompted
It is a free Google app, and it is what lets Colossus see workouts from Samsung Health, Strava and Garmin.
Sync
New sessions are imported and existing ones updated. Anything you logged by hand is never overwritten.

Worth knowing

If the screen says health access is incomplete, it means your phone has no answer on file for some data types, not that you refused them. Use "Ask again" - Apple only shows the permission sheet once, so a type you skipped stays unanswered and silently empty until you do.
Anything that writes back to Apple Health or Health Connect can reach Colossus this way, so Strava, Garmin and most watches work without a separate connection.