You’ve seen the infomercials. You’ve heard celebrities singing its praises. Tony Horton’s P90X has now touched 2 million customers and continues to sell as well in 2010 as when it first exploded on the scene a few years ago. Millions of dollars in marketing and remarkable word of mouth have helped keep the phenomenon alive.

P90X stresses the importance of “muscle confusion” — switching up the order of routines and adding new movements during each phase, forcing the body to continuously adapt to new stresses so that it never plateaus.

A growing list of celebrities have reported using P90X. Film/TV: Ashton Kutcher, Demi Moore, Jennie Garth. Music: Sheryl Crow, Pink. Professional Athletes: Ray Lewis, David Akers, David Garrard, Ray Allen, Rajon Rondo.

Find out how P90X has become a household name in the world of fitness. Read our review or Visit the manufacturer’s site.

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