Intense Exercise Benefits the Young
Parents and doctors often encourage children to get more exercise, but questions remain about how hard kids need to work for health benefits to kick in. Researchers monitored physical-activity intensity in 600 kids between 9 and 17 years old by having them wear accelerometers, devices that measure movement, for seven days. Jogging or performing other vigorous activities for seven or more minutes each day was associated with lower body weight and blood pressure in the participants. The longer and more vigorously the children exercised, the less likely they were to be overweight and to have high blood pressure. Light or moderate physical activity, such as slow or fast walking, did not affect these health measures.
Source: Archives of Pediatric and Adolescent Medicine, November 2012