FWIW, I've done the 'lighter' version of this, Insanity.
First time I lost 20 pounds in 3.5 weeks (205 to 185)
Second time I lost 10 pounds in 2.5 weeks (200 to 190)
Both times helped me drastically improve my cardio. I only did them for 2-3 week stints to fill the gap between summer/winter or winter/summer hockey.
I've wanted to try P90x, for the strength training aspect. Just too much on my plate to commit
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