Watch Nicole Richie's Sweaty Cardio-Dance Routine

Celebrity Body Mar. 30, 2011 AT 5:07PM

When A-listers like Nicole Richie, Gwyneth Paltrow and Gisele Bundchen need to shed a few extra pounds, they turn to celebrity trainer Tracy Anderson.

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"When I first came to a class of yours, I heard I was going to be there for and hour and a half, and I was like, 'Oh, I don't do that,'" Richie, 29, says. "Now I'm in there two hours a day, four days a week. It's so fun and the time flies by. The music is great and I love the cardio."

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"The girl can dance! She's a rock star," Anderson raves of working mom Richie, who burns excess calories while dancing to Jennifer Lopez's "On the Floor" (watch above).

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"The dancing is so much fun for me," Richie explains of Anderson's routine. "This is the only workout that I've ever done that I've been able to eat whatever I want. I feel so great after I do it."

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