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BEST ABS

Winner: Zac Efron

There's more of him to love: The actor, 23, packed on 18 lbs. of muscle for the upcoming drama The Lucky One.

Winner: Audrina Patridge

The reality star, 26, doesn't rely on conventional gym equipment to manage her midsection. "I love dancing and running on the beach," she says.

BEST BUTT

Winner: Minka Kelly

"I care most about the booty," says the new Charlie's Angels star, 31, who does "like a million!" squats with trainer Gunnar Peterson.

BEST ARMS

Winner: Kellan Lutz

The Twilight star, 26, is into boxing and martial arts.

Winner: Jennifer Aniston

The yoga fan, 42, has said that "going to the gym gets my brain moving."

BEST LEGS

Winner: Rafael Nadal

The six-time French Open champion, 25, has opted for high-impact aerobic work while training.

Winner: Jennifer Lopez

Her fitness mantra: "The key is not to miss a workout," says the singer, 41, who uses trainer Tracy Anderson's DVDs.

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