I just finished my first week of p90x and have to say, I LOVE IT!! It wasn't nearly as hard as everyone is making it out to be but then again I've always been athletic even at my heaviest. I highly suggest anyone that is even considering this to dive in! There is a fitness test you should take before beginning that will determine if you need to start with p90 or p90x. I follow the diet as closely as I can which is probably the hardest part of the program! I haven't weighed myself yet (Monday mornings) but will let everyone know how it goes!