> Further intriguing results showed that those at the extremes of physical activity—either too little or too much—experienced accelerated biological aging. If

> Further intriguing results showed that those at the extremes of physical activity—either too little or too much—experienced accelerated biological aging. If it’s at the extreme end of exercise, chances are the effect can be explained mostly by injury. Especially once someone is elderly, an injury that puts them out of commission for months is often the beginning of the end.