I completed 90 days of P90X and had great results but wanted more of a challenge and even more results. The Pit workout does it and is more fun for me because I am interested in MMA for general fitness. I am noticing a higher level of strength and fitness, and getting a little more cut. P90X feels like aerobics compared to this! I still mix in the weights DVDs from P90X, but the PIT pushes your body harder. And you are still using just your body and don't really need equipment. John Hackleman is a cool dude and is helpful and instructive with no BS.