How Kate Upton Got In Shape for Her 'Sports Illustrated' Cover (We're Tired Just Thinking About It)

02/14/2013 at 04:30 PM ET

Kate Upton Sports Illustrated CoverCourtesy Sports Illustrated

What’s harder than posing almost naked in the freezing cold in Antarctica? Preparing to pose almost naked in the freezing cold in Antarctica.

We chatted with David Kirsch, the trainer who primed Kate Upton for her second Sports Illustrated cover, and let’s just say: Upton must be exhausted.

Kirsch began working with the supermodel back in August, and for the first two weeks, Upton met with him for sessions twice a day. From then on, the model exercised five to six days per week for one and half to two hours until the photo shoot in December.

“[She did] boot camp circuit training mixed in with cardio,” Kirsch tells PEOPLE. “Running, rowing and the elliptical.” He adds that there are six regions a model needs to focus on for an SI: Swimsuit Edition shoot: “Legs, inner thighs, hips, butt, abs and arms. Anything that shows when you’re wearing a bathing suit. Which is … everything!” (Especially when that bathing suit is as tiny as some of the ones Upton sported!)

It wasn’t just the constant sweat sessions that got Upton ready to strip down; she was also extremely careful about what she ate. “She followed my ABC’s — no alcohol, bread or processed carbs – and no sugar — 24/7 with no cheat days,” the trainer reveals.

Along with not eating pasta, pizza, candy or apparently anything else that tastes delicious, Upton did Kirsch’s seven-day cleanse for two weeks out of every month they worked together. And during the other two weeks? She regularly drank protein shakes and green drinks to stay energized.

Despite all that, Kirsch says Upton didn’t complain once throughout the exhaustive process. Though, the same can’t be said about Upton while she was kneeling on an iceberg in nothing but a string bikini. But can you really blame her?

Tell us: What’s your take on Kate Upton’s workout regimen and diet? Worth it or way too intense?

–Jennifer Cress

PHOTOS: FIND OUT MORE CELEB FITNESS TRICKS!

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Showing 56 comments

courtney on

What food does that leave you with then? Hard to work out without eating any carbs. …no energy

WG on

No bread is easy, no alcohol?! That’s a tough one.

carbs are fine in small doses as long as its not enough to screw with your blood sugar

asd2mom on

too intense and definitely does not sound healthy at all….the irony is that still there is a huge chorus of fools who are writing that Upton is too fat…i think this nation has lost its collective mind and has forgotten what a healthy woman’s body looks like as compared to these anorexic models and actresses.

martinvonmilk on

carbs come from vegetables… and energy can come from good fats like olive oil…

martinvonmilk on

@asd2mom – when most americans are statistically overweight , it does seem strange that upton would get hit with that criticism…

martinvonmilk on

@asd2mom her diet sounds really healthy to me – not for the longterm but for a few months to achieve goals, it’s perfect. it’s super high lean protein, very low sugar/carbs and most likely with the proper balance of good fats and oils. tons of vegetables.

Pinkdaisy on

The girl is hot! Period.

:)

lola on

Really, Courtney? Fruits/Vegetables, lean protein

Jane on

She must have been really FAT then……..because she does NOT look toned or slim. That type of diet and exercise regime would leave most looking anorexic if they were already a slimmer person. She still looks chubby to me, or at least, not toned. She has no muscle definition whatsoever. If it weren’t for her boobs, she really wouldn’t have that nice of a body. Very average looking.

D on

Hard to believe she was that strict.. She never lost her boobs and really doesn’t look that lean. SHE looks fantastic don’t get me wrong. For the training regime she mentioned I suspected leanness

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