In most aspects of life, many of us are multi-taskers. So why not in our workouts? Doesn't it make perfect sense to work a variety of muscles with each exercise you perform?

I think so, and so does author (and former body-builder) Anita Bean, who designed a 15-minute workout that will truly work your whole body. Each move is designed to work two or more muscle groups, letting you get a full workout in half the time. To see her suggested moves, visit Health.com.

I like push-ups and planks, personally, and I also like playing sports, like volleyball, that work different body parts. What are your favorite ways to work multiple muscles?