The more exercise people get, the less their cells appear to age. In a new study in Preventive Medicine, people who exercised the most had biological aging markers that appeared nine years younger than those who were sedentary. Researchers looked at the telomeres from nearly 6,000 adults enrolled in a multi-year survey run by the Centers for Disease Control and Prevention. People were asked what physical activities they had done in the past month and how vigorously they did them. They also provided DNA samples, from which the researchers measured telomere length.
