As for mixing it with weight lifting. I haven't done that yet, because insanity is tough enough already. Once I'm done I plan on mixing weight lifting with it though. I would pick 3 good insanity workouts for 3 days and incorporate weight lifting the other days. Also with insanity your...
I have done the p90 x workouts as well and I"m doing the insanity right now.. I can say that insanity is a lot harder due to the vast amount of cardio that your doing everyday. I'm on week 4 and I can already notice my body getting more toned and have lost some body fat. after finishing the...