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Stars' Workout Shout-Outs

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

CATHERINE'S DANCE-OFF

The Broadway star's fitness secret? "It's called A Little Night Music!" Zeta-Jones says, joking, "I recommend it to anybody: Do eight shows a week and you'll be so fit." Cardio workouts supplement her regimen.