You can sync activity data to Strava from the Android Samsung Health app. We don't have any plans to directly support Samsung Gear at this time.
- Record your activity with the Samsung Health app and your Samsung Gear device.
- Connect Samsung Health to Strava: From the main screen, go to "More" -> "Settings" -> "Connected Services"
- Log into your Strava account. Workouts will then automatically be uploaded to Strava.