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Not sure about others, but for Apple Watches:

Apple Watch -> Health App <- Strava

Strava can directly import workouts from the health app if you don’t like using their app to record your workouts

I don't think that's how Strava on Apple Watch works

It works like this if you're simply using the Apple Workouts app on your watch, instead of the Strava app. If you use the Strava app, it'll upload directly, as well as, write to your Health data. If you use Apple Workouts, it'll detect the workout for Import (if you don't automatically import), and read that from Health.

Could be that they do that directly now, but some years ago you had to "route" the data through their (Suunto's and Garmin's) servers, yes.

I guess I’m tangentially working on doing that for Apple Watch for some personal stuff. I can do a blog post on it sometime.

I use the WorkOutDoors app on Apple Watch. It uploads workouts directly to Strava.