sedentary behavior

Paleoanthropologist Daniel Lieberman says the concept of "getting exercise" is relatively new. His new book, Exercised, examines why we run, lift and walk for a workout when our ancestors didn't.

If you sit too much during middle age — at work and at home — your ability to exercise or even walk in late decades is at risk, research hints. And, of course, your risk of heart disease climbs, too.

If you sit too much during middle age — at work and at home — your ability to exercise or even walk in late decades is at risk, a study hints. And, of course, your risk of heart disease climbs, too.

American adults play more golf than any other sport. So how much exercise do you get from an afternoon on the links? Players clipped on pedometers and Fitbits to help us find out.