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If your workout battery is losing its charge, a new group exercise class called Yoga Booty Ballet can spark your enthusiasm. The class I took at Swerve studio in Los Angeles got me soaked in sweat during the dance segment, while the end-of-the-hour yoga left me feeling grounded. "You might feel like a total clod at first, but after 10 minutes you feel beautiful and strong," says Teigh McDonough, an American Council on Exercise-certified trainer who co-created the class with Gillian Marloth. I'll vouch for that. And though the class was the roughest hour of training I've endured since I don't know when, the vibe made it easy to find my "I can do it!" juice and get through the thigh-burning moves like Dancing Shiva and killer backside toners such as Booty Leg Lifts.