"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." When I'm planning my fitness routine, my goal is not to spend as much time as possible sweating. It's ...

Do you even know what HIIT stands for? We have the answer to that—and more.

Add Yahoo as a preferred source to see more of our stories on Google. No matter what aerobic or anaerobic activity you're drawn to, "the best exercise is the one you're willing to do," says Austin ...

Want an exercise program that helps you work out smarter, not harder? You've found it. The Women's Health+ Ultimate HIIT Challenge is a week-long program that combines high intensity interval training ...