How Does Katherine Heigl Stay so Fit?
The question on everyone’s mind! But being a celebrity, you have to realize that your body is ultimately your temple as well as your tool. Good genes combined with healthy eating habits and a rigurous workout all contribute to Katherine’s amazing shape. So how does she stay so fit? 
Before fiming the hit movie “Knocked Up” Katherine admitted that she hated dieting as well as working out.
“I hate dieting. I hate the whole thing!” she tells PEOPLE in its new issue.
“Katherine had a beautiful body, but it had never been toned,” says Pasternak, who has worked with Halle Berry, Jessica Simpson and Sheryl Crow.
Katherine, 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. Even with a scheduled weekly “cheat day,” says Pasternak, Heigl soon looked “tighter and more toned.”
As for the former gym-hater, Heigl says now, 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 says. “I wake up and I go, ‘My god, I can’t believe this is my body!’ “