These workouts also burn calories and improve fitness. One of Porcari’s studies found that the average boot-camper expended about 10 calories per minute during the training—not quite as much as ...

Why would anyone sign up for “boot camp” if she didn’t have to? “It’s a great workout for endurance. It’s fantastic,” said Diane Broody, 43, of Pringle. “I like when I see I can keep up with the men. ...

And, here's how to find your sweet spot for timing.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. So where should you ...