What does the American Heart Association Say?

Fitness comes from being able to perform standard types of activity such as playing with your kids, taking the stairs and mowing the lawn. So being thin doesn't necessarily mean being fit. In fact, a recent study by Harvard University School of Public Health , indicated that thin women who were sedentary had a 55 percent increased risk of dying compared with thin women who were physically active. So, maintain a healthy weight by being active!