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.
In 2004, the completed program was released, and an infomercial was made using some of the documentary footage.
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.
There are six programs associated with the Power 90 name: Power 90, Power 90 Master Series, P90X, P90X+, P90X One-on-One, and P90X2  (released in 2011).
Program overview 
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.
Exercises overview 
The P90X program cycle lasts 13 weeks, exercising six days per week. The program has three "rotations" or emphases, called "classic," "lean" and "doubles," that the individual selects according to their personal goals. There are a total of 12 DVD workouts included with the program; each targets different skills and muscles. Most of the workouts are less than an hour in duration, although the abdominal workout ("Ab Ripper X") is performed three times per week, after six of the rotating workouts, which adds approximately 15 minutes of exercise to the times in the table below.
|Program||Exercise||Week||Muscles Worked||Type||Ab Ripper X||Length||Equipment|
|P90X||Chest and Back||1-3, 9, 11||Pectorals, Back, Biceps, Triceps||Strength Training||Yes||52:50||Weights or Bands, Push-up bars, Pull-up bar or bands, Chair, Fitness guide and pen, Water and Towel|
|Plyometrics||1-3, 5-7, 9-12||Legs, Full Body||Cardio||No||58:36||Heart rate monitor, Mat, Stool or Chair, Water and towel|
|Shoulders and Arms||1-3, 9, 11||Biceps, Triceps, Shoulders||Strength Training||Yes||59:53||Weights or bands, Wall, Chair, Fitness guide and pen, water and towel|
|Yoga X||1-13||Full Body||Cardio, Stretch||No||92:24||Mat, Yoga blocks, Water and towel|
|Legs and Back||1-3, 5-7, 9-12||Quads, Hamstring, Calves, Back||Strength Training||Yes||58:56||Weights or bands, Wall, Pull-up bar or bands, Chair, Fitness guide and pen, Water and towel|
|Kenpō X||1-13||Full Body||Cardio||No||58:46||Heart rate monitor, Water and towel|
|X Stretch||1-13||Full Body||Stretch||No||57:32||Mat, Yoga blocks, Water and towel|
|Core Synergistics||4, 8, 13||Full Body||Strength Training||No||57:27||Mat, Weights or bands, Plastic plate, cardboard or towel, Water and towel|
|Chest, Shoulders and Triceps||5-7, 10, 12||Pectorals, Shoulders, Triceps||Strength Training||Yes||55:44||Weights or Bands, Push-up bars, Plastic plate, cardboard or towel, Chair, Fitness guide and pen, Water and towel|
|Back and Biceps||5-7, 10, 12||Back, Biceps||Strength Training||Yes||51:36||Weights or bands, Wall, Pull-up bar or bands, Chair, Fitness guide and pen, Water and towel|
|Cardio X||doubles||Full Body||Cardio Workout||No||43:18||Stool or Chair, Mat, Yoga blocks, Heart rate monitor, Water and towel|
|Ab Ripper X||weekly||Abdominals, Core||Strength Training||N/A||16:07||Mat, Water and towel|
|P90X+||Upper Plus||1-3, 5-7, 9-12||hips up: chest, back, biceps, triceps, shoulders||Strength Training||No, Abs/Core Plus instead||40 min||push-up stands, weights or bands, pull-up bar, water and towel|
|Interval X Plus||1-3, 9, 11||Full Body||Cardio Workout||No, Abs/Core Plus instead||40 min||Heart rate monitor, water and towel|
|Total Body Plus||1-3, 5-7, 9-12||Full Body||Strength Training||No||45 min||push-up stands, weights or bands, pull-up bar, water and towel|
|Kenpo Cardio Plus||1-3, 5-7, 9-12||Full Body||Cardio Workout||No||40 min||water and towel, heart rate monitor|
|Abs/Core Plus||1-12||Abs and Core||Strength Training||No||20 min||Mat, water and towel, weights or bands, pull-up bar|
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.
In Popular Culture 
The singer P!nk told in the Oprah Winfrey Show on February 5, 2010 that she gets her body in shape for tours with P90X. She was interviewed after her "Glitter in the Air" performance at the 2010 Grammy Awards show. Singer Bruno Mars references P90X in his hit "The Lazy Song". Paul Ryan, Republican Party nominee for Vice President of the United States in the 2012 election, has performed P90X.
- "Clips from Last Night: Tony Horton on Paul Ryan's P90X plan; Race team details surviving their horrifying car crash – Piers Morgan - CNN.com Blogs". Piersmorgan.blogs.cnn.com. Retrieved 2012-10-22.
- LINDSAY GOLDWERTWednesday, August 15, 2012 (2012-08-15). "What is the P90X workout? - New York Daily News". Articles.nydailynews.com. Retrieved 2012-10-22.
- Lulay, Stephanie (5 January 2010). "Feel the burn: get ripped in 2010". Chicago Now. Retrieved 12 January 2010.
- Deprez, Esme (18 November 2010). "Beachbody: Thinking Beyond the Infomercial". Bloomberg. Retrieved 3 December 2010.
- Vicky, Hallett (9 December 2008). "Ask the Misfits". Washington Post. Retrieved 10 August 2009.
- Tsouvalas, Dean (26 October 2009). "The Ultimate Business Traveller Workout". ExecDigital. Retrieved 12 January 2010.
- "P90X:MC2 Workout — The next P90X — Beachbody.com". Retrieved 9 February 2011.
- Carney, Kat (30 April 2004). "Get the jump on fitness". CNN. Retrieved 10 August 2009.
- Farr, Ned (Infomercial Director); Horton, Tony (Instructor) (2003). P90X Extreme Home Fitness Workout Series (DVD (x12)). USA: Product Partners, LLC.
- "Fitness Plan: P90X". Beachbody.com. Retrieved 2012-10-22.
- "p90x workout". p90xdvd.org.
- In the line, "Tomorrow I'll wake up, do some P90X", in the 7th verse of The Lazy Song.
- "Paul Ryan's workout: Is P90X for you?". cnn.com. Retrieved 9 February 2013.