CrossFit on MSN

If your gym suddenly looks like a cross between a gymnastics studio and a Marine Corps boot camp, chances are it's offering CrossFit classes. This fitness craze that's swept the nation in recent years was developed by a former gymnast in Santa Cruz, California, named Greg Glassman. The grassroots movement started with Glassman's rudimentary Web site on which he posted a daily workout routine (officially known as the "workout of the day" or simply the "WOD"). A dedicated following of police officers, firefighters and military types soon discovered the workouts, and from there, the wave just kept growing. Now, CrossFitters (as devotees are called) number in the thousands, and gyms across the country are offering this intense workout program.

"The workouts include elements of Olympic weightlifting, gymnastics, and track and field done in combinations that increase core strength and conditioning," explains Jake Platt, owner of Northwest CrossFit in Seattle. There are about 50 basic exercises that are mixed and matched to create the "WOD," and every day is different. "Routine is the enemy," says Platt, an N.A.S.M. Certified Personal Trainer. "We want to keep your body guessing and make sure that no adaption is happening that will lead you to plateau and stop seeing progress."

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Props to Shannon down in CA!