In this short video, Tony Horton — the creator of P90X and P90X2 — explains the difference between the two programs.
If you don’t want to watch the video, the upshot is that P90X gets you into shape, and P90X2 focuses on making you more athletic. It’s the same as the difference between Shaun T’s Insanity and Insanity: The Asylum.
You can order the programs through the links above or email me at [mailme] if you have questions. Ain’t nothin’ to it but to do it!