David Kirsch, trainer to the stars, tells you how to get that celebrity bod for your wedding

Heidi Klum's Abs

Exercise: Oblique Crunches, four times weekly

Works: external and internal obliques (they form the sides of your abs)

How to do it: Lie on right side with knees bent, right arm on the floor in front of you, left hand behind head. Crunch, lifting knees straight up and bringing left shoulder toward them; pause, lower and repeat. Do 15; switch sides.

Where to focus: Focus energy on engaging lower abs, not hip flexors. (You should feel it from your belly button downward.)

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