P90X or Power 90 Extreme is a home exercise system developed by Tony Horton in conjunction with Beachbody which aims for total body improvement in 90 days through rigorous interval training. The program emphasizes full body fitness through cardiovascular, strength training, and stretching exercises divided into three 30 day phases combined with an optional nutrition and supplementation plan.

P90X stresses the importance of muscle confusion (commonly referred to as cross-training) by switching the order of exercises, and incorporating new exercises during each phase. Muscle confusion prevents the body from adapting to the exercises over time and plateauing which has been considered a key factor in the overall success of the program. Several professional athletes and celebrities including Matt Diaz, David Akers, Sheryl Crow, Ashton Kutcher, and Demi Moore have unofficially endorsed the product in various interviews and on social media sites, such as Twitter, when asked what type of training they used to get into shape.

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