Interested in trying out Zumba? Devotees know it's a killer workout with infectious music and a committed following. But if you're on the fence about whether it's for you, check out these healthy benefits of boogie-ing down from Zumba instructor and education specialist Kass Martin. "I always tell people to give it three classes when they're first starting out," she says. "Once you go a few times, you start to recognize the repetitions in the dances, you'll start to get it, and you'll be hooked!"