For anyone juggling work, life, and limited time, the idea of spending hours at the gym can feel overwhelming. But what if just seven minutes of effort could yield real results? Sprinting — that short ...

Plus, exactly how to get results from whatever activity you love to do.

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." In a small study, sprint interval exercise helped to “clean-up and rebuild” cells better than ...