Bodywatch

Body Watch

UPDATED 06/11/2007 at 01:00 AM EDT • Originally published 06/11/2007 at 01:00 AM EDT

30
Number of pounds gained by George Clooney and Leatherheads costar Renée Zellweger, each, for Syriana and Bridget Jones's Diary respectively

THE KNOCKED UP SHAPE-UP

I hate working out. I hate dieting. I hate the whole thing!" gripes Knocked Up star Katherine Heigl. But a revealing love scene in the script gave her the motivation to hit the gym with L.A. trainer Harley Pasternak. "Katherine had a beautiful body, but it had never been toned," says Pasternak, who has worked with Halle Berry, Jessica Simpson and Sheryl Crow. Heigl, 28, met with him for cardio and circuit-training sessions of 25 to 50 minutes, up to five times a week for six weeks prior to shooting. On-set, she'd jump rope or lift dumbbells outside her trailer. All the while, she ate Pasternak's 5-Factor Diet, which delivered five high-protein, high-fiber meals a day (sample menu: French toast with ricotta cheese, Tex Mex chicken salad and sea bass). Even with a scheduled weekly "cheat day," says Pasternak, who never weighs or measures clients, Heigl soon looked "tighter and more toned." And the former gym-hater? A year after filming, she still works out regularly. "I used to have back pain. Suddenly, my body is supporting itself the way it's supposed to," Heigl raves. "I wake up and I go, 'My god, I can't believe this is my body!' How did this happen?"

GRIDIRON TO RED CARPET

Has George Clooney lost weight? It sure looked that way in Cannes. Thank his next film, Leatherheads, for getting Clooney in shape to promote his current one, Ocean's 13. "[It's a] football movie," says the noticeably trimmer star's rep of the comedy, which recently wrapped shooting in South Carolina. "The part called for it."

For more on Heigl's plan, go to PEOPLE.COM/HEIGLWORKOUT