**Intact Gift Giving Condition book**

These engaging stories and explanations will revolutionize the way you think about exercising—not to mention sitting, sleeping, sprinting, weight lifting, playing, fighting, walking, jogging, and even dancing. If exercise is healthy (so good for you!), why do many people dislike or avoid it? “Strikes a perfect balance of scholarship, wit, and enthusiasm.” —Bill Bryson, New York Times best-selling author of The Body • If we are born to walk and run, why do most of us take it easy whenever possible? • Does running ruin your knees?