The celebrities who appear on "Dancing with the Stars" often lose weight and always strengthen their muscles, and you'll see why when you join professional dancers Edyta Sliwinska, Chelsie Hightower and Kym Johnson for a trio of workouts. Throughout their careers, these hardworking women have used dance to burn fat and boost endurance -- and in these routines, they'll teach you steps to jazz, hustle and mambo rhythms that entertain and energize.