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

From Kim Kardashian's cellulite challenge to Adriana Lima's pregnancy workout, get the scoop on how to look fab like the stars

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Though she helps contestants on The Biggest Loser to work as a weight-loss team, tough-love trainer Jillian Michaels prefers the solitary aspect of martial arts to stay in shape. "I'm forced to learn new things and I find it challenging," she says of favorite practices including Brazilian Jiu-Jitsu and Aikido. "I'm not a team sport girl. I hate to lose – I'm the most competitive person in the world, and I can't stand not being in control." – Christina Yoon