So I'm considering starting Insanity soon as the max interval training concept is really appealing to me but I have one thing giving me doubt as whether I really should. P90X works all areas of the body w/equipment required. Insanity however requires no equipment which is a great advantage but I don't see how you can work your back in the program whereas P90X uses a pullup bar. Insanity has pushups in the program to develop your chest but if you only work your front eventually they will be more developed than your back muscles and create a hunch. I can't think of any back exercises you can do w/your bodyweight besides pull ups which are non-existent in the program. I have not seen the Insanity videos yet but are there workouts in there that incorporate your back to balance everything?

More...