Tone Up With Kim Kardashian's Workout

The star's trainer, Gunnar Peterson, shares three toning moves that keep Kim Kardashian in top shape.

Butt Booster

Stand on an unstable surface, like a CorDisc or BOSU, with feet hip-width apart, knees soft, a weight in each hand at shoulders. Keeping abs engaged to stay steady, squat (as shown). Return to standing. Repeat. Do 2 sets of 16 reps.

Waist Cincher

Start in side plank, resting on left forearm with legs stacked, hips lifted; hold a weight in right hand, elbow bent 90 degrees, to start (as shown). Maintain plank as you rotate torso forward, bringing weight to left armpit. Return to start for one rep. Do eight reps. Switch sides; repeat.

Power Punch

Stand with feet hip-width apart, knees soft, fists at chin. Powering through abs, pivot from hips, allowing right fist to follow. Switch arms and repeat. Do 3 sets: 30 reps, 50 reps, then 76. (Yes, 76. Peterson says he likes even numbers!)

She Works Hard and Sees Results

"I lift weights with my trainer, Gunnar Peterson, in the morning three days a week," says Kim. "After working out, I see a difference in my butt and thighs, and my clothes fit a little differently, too. I'm also really proud of how toned my arms are."

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