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Chrissy Teigen, Lily Aldridge and Nina Agdal share their butt tips

Not surprisingly, Chrissy Teigen, Lily Aldridge and Nina Agdal had to sweat to get their butts looking so good for the 50th anniversary issue of Sports Illustrated's Swimsuit edition. In an interview with OK! magazine, posted on Wednesday, Feb. 19, the three models shared how they get their behinds in shape.

(L-R) Models Lily Aldridge, Chrissy Teigen, and Nina Agdal onstage at Club SI Swimsuit at LIV Nightclub hosted by Sports Illustrated at Fontainebleau Miami on February 19, 2014 in Miami Beach, Florida.
Photo by Neilson Barnard/Getty Images for Sports Illustrated

For Nina, it's all about “lots of squats" and "lots of running."

"I go to Barry’s BootCamp, and they have a whole workout routine for your butt and your legs. It will help you out that way," she added.

Chrissy Teigen credits her behind to Ballet Barre classes and Physique 57 workouts.

As for Lily Aldridge, she does Ballet Beautiful “four times a week for an hour."

Of course, the models also have to eat right. Lily makes sure to eat a lot of fish and vegetables so that she's not tempted to eat fattening snacks.

Not everyone is pleased with the cover however. The "Today" show even censored it during its segment with the three models, prompting them to defend the photo.

Who do you think looks best on the cover? Chrissy Teigen, Lily Aldridge or Nina Agdal?

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