The National Association for Sport and Physical Education (2002) recommends that preschoolers accumulate daily at least 60 minute of structured physical activity (e.g., in short bouts of 15 minutes each) and between 60 minutes and several hours of unstructured physical activity. They should not be sedentary for more than 60 minutes at any time (except for sleep, of course). As preschool teachers know, requiring too much sitting is at odds with young children’s characteristic mode of learning through activity—through moving, exploring, and acting on objects.