That confirms what I have read elsewhere—Insanity has more of an emphasis on cardio than P90x.
You don’t need to be insane.
Once you’re used to high intensity, it’s enoyable.
I plan on getting back into it, after being away from it for 20 years.
I plan to use rubber resistance, instead of weights, because I don’t have the room for a good weight set. And the only thing the body recognizes about resistance is that it is resistance. The form of the resistance is irrelevant.