Sitting can wreak havoc on your health, and not just in the form of minor aches and pains. Recent studies show that too much sitting contributes to a host of diseases--from obesity and diabetes to cancer and depression. The typical seated office worker suffers from more musculoskeletal injuries than those workers who do daily manual labor. It turns out that sitting is as much an occupational risk as is lifting heavy weights on the job. The facts are in: sitting literally shortens your life. Your chair is your enemy, and it is...