For Garmin watches, auto activity tracking is under Settings > Activity Tracking > Status On. This shows up in Garmin Connect under graphs such as Body Battery, Heart Rate, etc. These auto tagged items don't show up as discreet activities and will not show up in other systems like Strava.
This is on the Forerunner 945 and will auto tag things like walks, runs, and cycling.
This is on the Forerunner 945 and will auto tag things like walks, runs, and cycling.