Sizing Up Jennifer Aniston and Brooklyn Decker

May 7, 2010— -- Jennifer Aniston has a body that women half her age would kill for.

But reports surfaced earlier this week that the 41-year-old former "Friends" star flew her personal trainer, Mandy Ingber, to the Hawaiian set of her new movie after seeing her on-screen rival, Sports Illustrated swimsuit model Brooklyn Decker, who, at 23, is little more than half Aniston's age.

Aniston's spokesman, Stephen Huvane, dismissed the reports.

"Jennifer has a trainer she works with all year round and has not specifically flown her in to Hawaii after seeing Brooklyn Decker," he told ABCNews.com. "That's just plain silly."

Other reports claim Aniston dropped seven pounds in seven days on a baby food diet she started on the set of "Just Go With It," a film about a love triangle between her, Decker and Adam Sandler. The film also stars Nicole Kidman.

The diet, concocted by Madonna and Gwyneth Paltrow's famed trainer, Tracy Anderson, consists of 14 portions of pureed foods, including oatmeal, pears with cinnamon and soups containing dandelion greens, along with a dinner of lean meats and vegetables. But, Huvane said, Aniston's not gobbling up jars of baby food.

The reports are "absolutely false," he said.

So it seems Aniston keeps her figure svelte the old fashioned way: with a finely tuned exercise program.

"Jennifer maintains a slim physique and tends to start off in pretty stellar shape," Aniston's trainer Ingber told InStyle magazine last year. "We blend yoga with toning exercises and cardio."

Aniston opened up to Self magazine in 2006 about how yoga has bettered her mind and body since she started practicing in 2005.

"My legs got leaner," she said. "My arms got strong. I've maybe even grown half an inch from aligning my spine. But that's all just cherry on top. When you're holding a pose, you learn to be patient with yourself. You'll get there, and if you fall out of it, it's OK. It's not a contest. It's not a race. It's just life."

How Does Brooklyn Decker Do It?

Like Aniston, Decker also works to keep her body in top condition. She has even ventured into the exercise industry, starring in Elle's "Make Better" series of fitness videos, which came out earlier this year.

Decker's videos feature 25-minute regimens based on yoga, cardio and sculpting. She told Us Weekly magazine in February that she relies on mixing up her routine for maximum results.

"Yoga's probably the thing I held onto most because I noticed it really enhanced my other workouts because I work out like an athlete," she said. "I go for long runs or spin classes and I do weights, which I think a lot of women are scared of. I think it's so important to do weights, because they don't make you bigger, they make you more lean and toned and all that good stuff."

It probably helps that Decker's husband, tennis pro Andy Roddick, makes physical activity a priority, as well. But she's not about to hit the court with the man who can serve a ball at 155 miles an hour.

"That," she told The New York Times last year, pointing at her face, "puts my job at risk."

Who do you think looks better, Jennifer Aniston or Brooklyn Decker?