3.  Tony Horton is Entertaining:  The creator of the program, Tony Horton., is encouraging and easily understood.  He is motivational  P90X WorkOut   sounding mechanical.  Some fitness instructors on video can sound annoying.  Tony Horton has a smooth approach but intense enough to keep you going.  You get pumped up during each workout.

4.  Minimal Workout Equipment Required:  You only need a few small equipment to do P90X.  Some items you need are a Pull-up bar, yoga-mat, push-up stands, and some light Barbells.  The days of heavy, bulky workout equipment that takes up a lot of space are over.  You just need your own body weight for most of the routines.

http://nationalfitnesspoint.com/p90x-workout/