Yeah he's very motivational - I caught few videos of the P90x guy, but he doesn't seem to have the same motivational energy. I could be wrong on that as I only checked about 1-2 mins of those vids.
Focusing on this for now, so far the only thing I seem to struggle with in terms of muscle fatigue are my thighs. My calf muscles aren't in pain at all, but hollllllyyy crap do my thighs and smaller muscles around my knees (muscles, not the joints/ligaments in my knee or anything) are going through hell.
Started taking some protein shake supplement thing called Carnivore after the workout to recover torn muscle fibers, but damn, stuff is pretty nasty.
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Strength is Nothing, Stealth is everything.
http://www.youtube.com/watch?v=pBU4vL0IXbo&feature=user