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The Fit 5: Tips to Feel (and Look) Like a Star!

From Eva Longoria Parker and Hilary Duff's body-conscious workout gear to Ciara's diet secret, get the scoop on how to look fab like the stars

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DEFINE YOURSELF

When fashion models hit the gym, they want to gain definition – not bulk. "They can't have Terminator arms," says New York City trainer Oscar Smith, who has worked with Petra Nemcova and Selita Ebanks. To help them get long and strong, Smith has his clients mix up light weight training (just 3 lbs.!), core and leg work on the mat as well as plenty of cardio intervals. The results? "Lean, but never unhealthy." Learn how to lose arm jiggle with Health.com's surefire workout! – Charlotte Triggs