Wear It on Your Non-Dominant Hand
While Apple doesn’t advise users to wear their Apple Watch on a specific hand, it’s recommended that you wear it on your non-dominant hand. If you haven’t been, you’ll probably notice your workout and step readings will likely get much more accurate with the switch.
That’s because you likely use you dominant hand much more than the other one. Just think about all those times you shake a workout bottle or stir a pot while cooking. All of that contributes to you activity, meaning that you might not get the most accurate number.