P90X, or Power 90 Extreme, is a commercial home exercise regimen, developed by a team lead by Tony Horton. It is designed to take 90 days, and consists of a training program which uses weight training, martial arts, yoga and calisthenics and also include advice on nutrition and dietary supplements. It was made famous by Paul Ryan.
- 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 on November 16, 2012.
- LINDSAY GOLDWERT (2012-08-15). What is the P90X workout? - New York Daily News. Articles.nydailynews.com. Retrieved on November 16, 2012.