If you’ve been putting off running because you think it’s hard on your joints, you’ve got one less excuse.  According to the September 2009 issue of Harvard Men’s Health Watch, the famed Framingham study conducted between 1993 and 2005 found no link between exercise and arthritis of the knee. In fact, the most active people in this study were shown to have the same risk of arthritis as the least active. A separate Australian study went one step further to prove that people who performed the most vigorous weight-bearing exercise had the thickest, healthiest knee cartilage. In 2008, another study, which compared runners to non-runners, found little evidence that exercise causes arthritis.  So what are you waiting for? Lace up those sneakers!