The paper indicated the Active group has doing at least 150 minutes of moderate-intensity physical activity throughout the week, or 75 minutes of high intensity activity activity (matching WHO guidelines[0]), and have done so for at least six months.
Anecdotally, I and several other people have found smart watches good for keeping track of intensity minutes.
Anecdotally, I and several other people have found smart watches good for keeping track of intensity minutes.
[0] https://www.who.int/initiatives/behealthy/physical-activity