Easily, the leading barrier to physical activity I have heard over my career is ‘lack of time’. But, is time really a barrier to physical activity? In one of my favorite studies on his issue, 24-hour activity diaries found adult women spent 28 hours per week in sedentary leisure-time activity.1 In other words, their reports that lack of time is a barrier do not reflect actual time available for physical activity, and might not be a...