Kate Upton, Bikini

Jackson Lee/Splash News

Out of all the amazing physiques in Hollywood, Kate Upton's just might be the most talked about this year. Most of that chitter-chatter is about how fantastic the 21-year-old looks in a two-piece.

Well, now thanks to her personal trainer Justin Gelband, we know exactly how she manages to do so.

Speaking to Shape magazine, Gelband reveals the blond bombshell's workout routine is a combo of Zumba, martial arts and functional training capoeira, Pilates and yoga. The program is called ModelFIT, understandably, considering Gelband's clients also include Victoria's Secret Angels Erin Heatherton, Candice Swanepoel and Lily Aldridge.

The NYC-based fitness guru's classes run just under an hour (about 45-50 minutes) and each session cost $40.

Of course, the program doesn't end in the gym. Gelband also told Harper's Bazaar, diet is essential to his regimen:

"When I sit down with anyone to discuss their workout regimen, the first thing I say to them is, ‘The one thing I really want you to concentrate on now is limiting the amount of things you are putting into your body that you do not need. No sugar (except for berries), no salt, no alcohol, limit your carbs.''

Complicated? Yes. But you didn't think looking that great in a bikini was easy, did you? Plus, keep in mind this sounds a whole lot easier than the crash diet Katy Perry went on before her Vogue cover!

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