Someone can train for a marathon and simultaneously qualify as a couch potato, recent research shows, raising provocative questions about how sedentary most of us really are.
The amount of time that most of us spend sitting has increased substantially in recent decades, especially as computers and deskbound activities have come to dominate the workplace. According to one telling recent study, the average American sits for at least eight hours a day.
Such prolonged sedentariness may have health consequences, additional research shows. A study of almost 2,000 older adults published in August, for instance, found that those who spent the most hours seated every day had a greater risk of high blood pressure, elevated blood sugar, a poor cholesterol profile and body-wide inflammation than those who sat the least, no matter how much either group exercised (which, generally, was not much).