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 view '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.