The crunch is the most popular abs exercise because anyone -- out-of-shape housewives, couch-dwelling video game fanatics--can do it. But that doesn't mean it's the best exercise for training your middle. "Crunches flex your trunk," says David Jack, owner of Actv8 Phoenix and creator of The High-Intensity Body-Weight Workout. "But the main function of your core is to prevent movement and resist force through your torso."

That's why Jack recommends adding 360 abs to your workout routine. While in a pushup position, you must keep your torso completely still as your legs create sweeping circles in different directions. Doing smaller loops hit your six-pack muscles, while bigger ones hit your entire midsection including your obliques, hips, and lower back. The result: an exercise that sculpts a washboard stomach and improves core stability all at once. Watch the video below to learn how to do 360 abs with perfect form.

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For more exciting and cutting edge exercises to shake up your fitness routine, check out Men's Health DeltaFit.

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