Kristin Cavallari says she takes a circuit training class at her gym that kicks her ass!

“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.”

“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.”

As for her diet, Cavallari’s secret is 6 days on and 1 day off!

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

Kristin also said if you have a workout buddy that helps too!

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