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Twenty million DVDs don't sell themselves. P90X is one of the most popular workout DVDs on the market for home fitness. Men and women alike are being challenged to push the bounds of their physical limits and seeing weight loss and muscle toning results. Tony Horton is the celebrated expert behind P90X and he teaches a training technique called "muscle confusion," which accelerates the result process by constantly introducing new moves and routines into your workouts. This prevents plateaus and boredom. Each of the 12 workouts focuses on a different area of the body with different actions. P90X also includes a three-phase eating plan.