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Stars' Workout Shout-Outs

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

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NATASHA BEDINGFIELD JUMPS FOR JOY

The super-fit singer combines a fave childhood toy with a serious cardio workout: "I just started working out on a mini-trampoline for cardio and I absolutely love it!" she raves. "It's a great workout, jumping up and down!"