Your trainer:Bernie Zurella, a former World Kickboxing Association fighter and Army drill sergeant.

Now you get the exclusive.

You’ll need:A stability ball.

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(c) Chris Tobin

Your plan:Combine these moves with thisstability ball ab workoutfor one awesome workout three times a week.

#sizemattersStandard balls are 55, 65 and 75 centimeters.

If your thighs are parallel to the floor, you’ve found your perfect fit.

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Lift left leg (as shown), hold for 1 count, then return to plank.

Hold for 1 count, then touch left knee to ball.

Extend leg back out for 1 rep. Do 12 reps; switch sides.

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Keeping left leg straight, bend at waist and reach toward left foot.

Return to start for 1 rep. Do 12 reps; switch sides.

Slowly lift right leg as high as it’s possible for you to (as shown).

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Slowly lower hips to hover just above floor.

Draw right knee toward ball and hold for 1 count.

Return to start for 1 rep. Do 12 reps; switch legs.

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