Stars' Best Parts

To maintain the bulging biceps he so prominently displays in the Mission: Impossible films, Cruise employs a personal trainer and brings along his own mobile gym to location shoots. "I work hard," he told PEOPLE in 2000, "but I love to work hard." With results like these, who wouldn't?

"Growing up, I'd be described as a colt," says the 5'10" Oscar-winning star. "Having long legs makes you geeky." But since she's stuck with them (poor thing), she keeps those gams gorgeous by hiking and swimming. Says Kidman: "I'm kind of a water baby."

"Even though I like to stay in shape," Berry has said, "I want to stay feminine." With personal trainer Robert White – "the only man I will trust with my body" – Berry does Pilates and a full-body workout with plenty of chest-press exercises, which, she said, "muscles up the right places."

"I've been every shape and size," says the former Ginger Spice, who has now figured out what she really, really wants: a balanced mix of cardio, kickboxing and, most important, an ab-solutely fabulous regimen of sit-ups and three yoga sessions a week. "Yoga's good for strengthening," Halliwell told PEOPLE in 2002. "With the breathing, it massages the stomach without your even realizing it."

He's now retired, but all that cross-training and practice (sometimes for up to three hours a day before a match) sure paid off. But Rafter can't take all the credit for his killer calves. "It's genetic," says brother Peter. "Dad had great legs, too."

The onetime 6-ft., 145-lb. Bratt bulked up in high school by running five miles a day, then hitting the mat for hours of wrestling practice. Now he maintains those muscles with rock climbing, tennis and surfing. As Bratt once told PEOPLE, "I like pushing the limits."

Talk about suffering for beauty. RampB star Usher squeezes in up to 1,000 stomach crunches every day, and when he's not on tour, he makes four two-hour trips to the gym each week. Still, even he has limits. "I don't touch weights," he says. "It's better to lift your own weight. That's why you see boxers punching the bag, doing jump-rope. It makes you stronger."

Before landing the lead on Alias, Garner "looked good," says her trainer, Valerie Waters, "but we had to step it up because spies are in really good shape." Garner keeps her arms toned with "three sets of biceps curls and maybe six sets of triceps" at least thrice weekly, Waters says, adding, "We focus on strength. She's not this girl that's ripped but can't do a pull-up."