People gain muscle with P90X because Tony Horton does such a great job with the workout. Muscle weighs more than fat, so if you have been experiencing weight gain on P90X that is the reason.
If you are P90X fanatic (there are many of you out there btw and we year nothing but good things about this program) you definitely get a set of Bodylastics to upgrade your overall workout experience. Blake Kassel explains why, and there is a link to a Bodylastics coupon code at the end of this post:
Get Your Bodylastics With a 5% discount using "peertrainer" as the coupon code
