 So they had a good variety of it. The teens spent about 42% of their waking time at school and a little more than a quarter of their time at home. They also spent about 13% of their time in their neighborhoods and 14% of their time elsewhere. So overall, the study found that they spent an average of 39 minutes a day engaged in moderate to vigorous physical activity, significantly less than the 60 minutes recommended for healthy development and obesity prevention. On school days, just over half this activity...