Doing a few hours of exercise every week will probably help you live longer, but doing a whole lot more exercise doesn't provide much extra benefit, according to a new study on physical activity and longevity.
Still, doing as much as 10 times the recommended amount of exercise was not linked with an increased risk of dying during the study period. That's good news for marathon runners and triathletes who may have been concerned about the long-term health effects of such high levels of activity.
