Bar Refaeli and Brooklyn Decker double-up thier hot bikini bodies for SI shoot (VIDEO)

Sports Illustrated bikini models Bar Refaeli and Brooklyn Decker doubled-up in hot bikinis and doubled the fun in a recent shoot for the sports mag.

The two models showed off their enviably, in shape bikini bods as they played in the sand, balanced on wood fixtures and danced in photos, dressed scantily clad.

Bar Refaeli, 24, has appeared on the cover of SI before and fans are all too familiar with her smokin', sleek mid-section, but she keeps her middle maintained by working the lower body.

When Refaeli's not working on her love connection with beau and actor Leonardo DiCaprio, Bar works her lower body with a variation of martial arts moves.

Unlike the kicking arts done by Twilight's Taylor Lautner, Refaeli's martial mix is a variation of self-defense that comes from her native country of Israel called Krav Maga.

Equally as hard working and gorgeous is Bar's photoshoot counterpart, Brooklyn Decker, who says that it's "always fun to look cute when you workout".

At just 22, the Ohio-born Decker has already been featured in pictorials for Teen Vogue, Cosmopolitan, FHM, and Glamour. Her professional modeling career includes clients like The Gap, Intimissimi and Victoria's Secret (Wikipedia). 

Decker, recently married to pro tennis star Andy Roddick in April of this year, says the hardest part to modeling is staying level-headed.

“The biggest challenge [in modeling] is seeing people I know get sucked into everything from the temptations to weight problems," AskMen.com quotes the star as saying, before tipping their online blog hats to her 34-24-34 dimensions.

And while Decker credits her bot body to "good genes" she't not one to always condone the pressure she's under.

When celebrity pop singer Jessica Simpson fell pray to weight jokes in a Burger King commercial earlier this month, Brooklyn Decker tweeted to her rescue.

"Can someone please explain to me the point of the Cartoon Cowboys BurgerKing commercial making fun of Jessica Simpson? Completely stupid," Brooklyn wrote on her Twitter page. "I think enough is enough with the weight scrutiny. She's beautiful. What example does that set for women?"

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