P90X2 Extreme Workout Program with Tony Horton Free Shipping : Online Business for $75.99 + free shipping
P90X vs. P90x2 Muscle Confusion
P90X changes your body using the principle of muscle confusion by combining resistance training, plyometrics, cardio training and yoga. This is the science behind P90X.
P90X2 uses these same principles as in P90X and also layers in a breakthrough sports science technique called Post activation potentiation (P.A.P.). P.A.P. stimulates power, speed, mobility and agility to improve athleticism.