Tired of ineffective workouts that sound great but produce less-than-optimal results? Turn to the P90X Extreme Home Fitness system, a bundle of 12 sweat-inducing, muscle-pumping workouts designed to transform your body from regular to ripped in just 90 days. Hosted by personal trainer Tony Horton, the 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. The more you confuse the muscle, the harder your body has to work to keep up. And the more variety you put into your workout, the better and faster your results will be. By breaking old routines and opening new doors, secondary and tertiary muscles are constantly being activated and developed.