I am not quite sure why this is pre-order December 6th when i stumbled upon it at my local target today. But anyway, in the beginning, in the middle, and at the end of the work out i was breathing heavy and sweating, and i do workout 4-6 days a week. When using his combination techniques of punching and kicking you work your triceps, biceps, abs, inner, and outer thighs. You start doing the rep at normal pace then you go into "explosion mode" where you kick up the energy and really get your heart rate up. In the land of Jillian, Bob Harper, and P90X this will defiantly go into my workout regimen for sure. Though, not needed because this workout is powerful on its own, i will be adding 1-2 pound weighted gloves just for the extra push. Love this workout!