Have you seen Sullivan Stapleton's six-pack in the new "300" film? They're impressive. But you may have thought to yourself, If I had a world-renowned trainer or endless hours to workout like a celebrity, I'd be shredded, too!

But you don't need the lifestyle of a movie star to get in great shape. All you need is a coach. Turns out, encouragement from a coach can boost workout performance by 12 percent, according to a study from Western Illinois University. And if each workout improves by that percentage, think about how much you'll increase your gains over just a few weeks or months. (Build a better performing body and a sculpted core with The Toughest Exercise You Aren't Doing (but Should)).

One of our favorite coaches is Dave Jack, creator of the new Men's Health 60-Day Transformation. With his chaos training, your muscles and fat cells won't know what comes next. You'll have to react quickly to switch directions and exercises on command from Jack, who pushes you to move your fastest and work your hardest. It's an efficient way to lose weight and get sculpted in your own house, on your own schedule -- just like your favorite celebrity.

Watch the video below to have Jack coach you through a series of chaos training called "read and react." If you like it, check out 50/10 Mayhem, an entire chaos training workout, in The Men's Health 60-Day Transformation DVD.

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Add these 4 Post-Workout Moves That Burn Fat to your regimen, and that extra belly roll will be gone soon.

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