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Stars' Workout Shout-Outs

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

MILA KUNIS KEEPS IT BALANCED

After enduring a dancer's strict fitness regimen for her role in Black Swan, the star says that there were pluses and minuses to her intense plan. "The best part was the challenge of it, the challenge of changing your body," she says. And did she keep it up after the movie wrapped? Not a chance! "To able to pretend to be a ballerina for five months was great – but boy, was I happy to get out of that life!" she laughs.