What are some ways sitting can hurt my health?

Sitting around -- driving, eating, working, knitting, emailing, watching TV -- is lethal. This isn't news. Everyone's known for a while that Coach Potato-Itis is a serious heart threat. And recent studies have shown that lots of sitting, even if you get serious amounts of exercise, messes up your blood sugar, blood pressure and cholesterol.

But here's the new shocker: Sitting causes cancer. Scientists have just tied 49,000 US cases of breast and 43,000 of colon cancer each year to prolonged sitting. That puts tush time right up there with smoking, obesity and a passion for pork rinds.