My Vivoactive 3 doesn't accurately measure steps when mowing, pushing a stroller or a shopping cart. As a comparison, I wore my Fitbit Surge on my other hand while mowing - the Fitbit registered approximately 10,000 steps, my Garmin measured 2,000 (I have a large yard, over 3 acres). The same thing happens when pushing a stroller or a shopping cart. My guess is the hand position, but the Fitbit does register when pushing those devices.