There's no question that regular exercise is essential to health. For the vast majority of our evolutionary history, we've had to exert ourselves -- often quite strenuously -- to get food, find shelter and simply survive.

While some progress has been made to reduce tobacco use and alcohol consumption and to promote healthier eating habits, the lack of regular physical activity has not yet been widely recognized as a standalone health threat.

Seven weeks ago I started running. Well, jogging actually - the runners are everyone else that pass me at breakneck speed. My run is changing my lif...

Sharon Gavin used to spend all day on her feet. Now she has a full-time desk job -- and the transition has been a painful one. In 2002, after 12 ye...