02/11/2011 10:29 am ET Updated May 25, 2011

Jennifer Aniston: How I Keep My Metabolism Up At 42

To celebrate turning 42 on Friday, Aniston is planning to go away with a group of friends. On the agenda: "Get up, have breakfast, have a workout, do something great outside," she says. Exercise on vacation? "Yeah, I know, it's annoying," she says, laughing. "But that way you feel great."

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