P90X, or Power 90 Extreme, is a commercial home exercise regimen, known for its intensity. It is designed to take 90 days, and consists of a training program which uses cross-training (weight training, martial arts, yoga and calisthenics) and periodization, combined with a nutrition and dietary supplement plan.
The system was developed by Tony Horton, Beachbody CEO Carl Daikeler, Beachbody Fitness Advisor Steve Edwards, nutritionist Carrie Wyatt, Creative Director Ned Farr, and workout video director Mason Bendewald.
In 2002, Daikeler tasked Horton to create a fitness program for people who were already fit. Daikeler hired Ned Farr to document the process of developing the new program, giving a "look behind the curtain." Development took two years. Horton consulted various fitness experts and experimented with several disciplines before selecting 12 workouts. The program was tested and refined with several 90-day test groups. Farr's video diary documentary originally appeared every month on Beachbody's website and can now be found on YouTube.
Farr continues to use a documentary approach to the infomercials, using raw home footage supplied by P90X graduates. "P90X: The Proof" infomercial won a Telly award in 2009 and "P90X: The Answer" infomercial won a Moxie award in 2010.
P90X is Beachbody's best-selling product after years of positive word of mouth and heavy infomercial advertisements. Despite sales growth slowing to approximately 30%, P90X represented half of Beachbody's $430 million revenue in 2010.  As of November 2010, 3 million copies of P90X have been sold for an estimated $420 million. The program had grossed approximately $500 million in sales, as of August 2012.
P90X uses the term "muscle confusion" in their advertising to refer to their training methods. Muscle confusion is said to prevent the body from adapting to exercises over time, resulting in continual improvement without plateau.
P90X is a 90-day program that combines a variety of exercise techniques including strength training, cardio, yoga, plyometrics, and stretching. The program consists of a nutrition guide, fitness plan, calendar and series of DVD videos demonstrating a variety of techniques. The models also demonstrate some moves at lower and/or higher levels of intensity. P90X provides a fitness test to determine if the program is suitable for an individual.
The nutrition plan is composed of three phases. The first 30 days emphasize higher protein and lower carbohydrates. The second phase increases the percentages of carbohydrates. The third phase further increases the carbohydrates.
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