Stand with the ball between your mid-back and the wall.
Move your feet about two feet away from the wall, with them placed a little more than hip distance apart. Slowly lower your body down into a squat position.
Squeeze your thighs and butt and lift yourself back up into the standing position. Push against the ball as you squat and lift.
Do 2 sets of 10 reps each.
Caption: Supermodel Heidi Klum [Images] is a mother of three, but her butt belies that fact.
Photograph: Stephen Lovekin/Getty Images
Also see: Hair styling and strengthening tips from an expert
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