P90X is a revolutionary system of 12 highly intense workouts on 12 DVDs, designed to transform your body in 90 days. Hosted by superstar trainer Tony Horton, this series of DVDs will help you get lean, bulk up, or grow stronger, with an endless variety of mix-and-match routines to keep you motivated. The secret behind the P90X system is an advanced training technique called "muscle confusion," which accelerates the fitness process by constantly introducing new moves and routines so that your body never plateaus and you never get bored. Excellent condition, barely used.