If you're 60 and older, every additional hour a day you spend sitting is linked to doubling the risk of being disabled -- regardless of how much moderate exercise you get, reports a new Northwestern Medicine® study. The study is the first to show sedentary behavior is its own risk factor for disability, separate from lack of moderate vigorous physical activity. In fact, sedentary behavior is almost as strong a risk factor for disability as lack of moderate exercise. If there are two 65-year-old women, one sedentary for 12 hours a day and another sedentary for 13 hours a day,...