Kristin Cavallari: I Kick My A** at the Gym to Get This Body!

Celebrity Body Jan. 11, 2010 AT 2:30PM
Kristin Cavallari: I Kick My A** at the Gym to Get This Body! Credit: BuzzFoto/BuzzFoto/FilmMagic

Kristin Cavallari's workout mentality?

No pain, no gain.

The Hills star, 23, takes a circuit training class at her gym that "kicks your ass," she tells UsMagazine.com.

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"I never want to go and I walk out dripping in sweat and it kills you, but it works," she admits of the class, called Burn 60. "And I feel good... This is the first time in my life where I’ve really been working out consistently."

What has prompted Cavallari -- who celebrated her birthday at Eve nightclub in Las Vegas Saturday -- to stick with her workout routine?

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"Once you see results, you want to maintain them and you want to keep it going and that makes you want to go to the gym," she tells Us.

Her other tip: "If you have a workout buddy -- my friend Misty been my No. 1 workout buddy -- it helps a lot to have a friend."

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As for her diet, Cavallari's secret to staying slim and trim is all about control -- and a reward!

"Control for six days of the week," she says, "and then letting yourself eat whatever you want on that one day!"

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