My sister and I are on day 3 of Insanity! Like dang! But it is not exactly what I thought. It isn't ALL cardio and there is stretching in the MIDDLE! P90X3 was challenging, this is crazy hard but the main thing is keep moving, modify, water breaks, and go until the end!!! She is almost 3 month post Pardum and I am helping her get into shape. It is fun having my sister with me along side!!!! Being a coach is so fun. 💪🏻