In a fascinating new study of how exercise and sedentary behavior can impact health, those who spent more hours sitting were at increased risk of dying prematurely. The study, published recently in a special edition of the British Journal of Sports Medicine, analyzed physical activity data from more than 44,000 middle-aged and older adults. Results suggested that people who were most sedentary faced a higher mortality risk. But what’s interesting about the study is that even among those who sat...