Kelly Ripa has been singing the praises of ballet-style exercise classes long before Black Swan was all the rage. Her go-to style is Physique 57, which combines ballet choreography and barre work with Pilates-style poses and isometrics. The toned talk show host has been the workout's most outspoken fan; she says the classes have "transformed my body in ways I never thought possible. I'm a short person, but I'm becoming longer and leaner. The class works your glutes, your abs, and your obliques. It's all about building muscle, then stretching it out."