This high-efficiency workout style boosts heart health, builds lean muscle, and transforms your fitness routine — all without a gym.

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? With countless ways to mix it up, this type of training is an efficient way to ...

If you only have 15 minutes to sweat, it's easy to skip out on a workout. I mean, how much can you really accomplish in 15 minutes, right? Umm, a lot, actually—if you spend them wisely. That's the ...