I just started doing the P90X classic rotation again - so I did chest/back/abripper X Monday, and Plyo yesterday. I am sooo sore! I don't know how I'm gonna get through arms & shoulders tonite and ab ripper again! I did a month of this program a few months back and I don't remember being this sore, and I've been doing my Cathe workouts non stop since. I can't imagine why I am so sore!