My BF is working on P90x right now - we both saw results as soon as 3 weeks...that was because he was dedicated to it, of course. I find it really intense, and I know a few people who bought it to try, only to find out that they couldn't work out each and every routine, so they gave up!
If you're going to invest in P90x, make sure you stick to the video, so that you won't waste $ like the people I know. =)
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