Like any new tech, trackers have their pros and cons, so nailing down benefits is tricky, says Kelly Evenson, Ph.D., a professor at UNC– Chapel Hill and the closest thing to a human fitnesstracker “tracker” there is. 

For example, one recent study she did suggested that trackers don’t improve health; but her newest research shows they can, indeed, lower heart disease risk—but only if used faithfully. 

For max usefulness, she says, wear it in the same position every day, update software often, and pair it with beneft.