Yeah, Mark's posts on Insanity and P90X pretty much cover it all. The main problem is, as with anything mass-produced to try to hook as many people as possible, it doesn't take into account that different people need different stimulus in order to get optimal results. It is definitely a lot of Chronic Cardio, and the progression isn't really a smart one. It also can lead to quick burnout with all the plyometrics taking a major toll on your central nervous system.
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