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Stars' Workout Shout-Outs

Fergie, Kelly Osbourne and more are talking up their favorite fitness tricks and must-do routines


"The training for [Black Swan] was so rigorous," says Natalie Portman, who returned to dancing after a 15-year hiatus. "Every break we had on the film they would take me through a barre to keep me warm. So we were doing barres all day long staying warm and staying ready to dance so that I wouldn't get injured."

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