I am teetering on obese and I started 2 weeks ago. Please do not despair at your initial results as I did. I wanted to cry the first week when I gained five pounds. You hear the broken records in internet-land telling you that muscle weighs more than fat but no one gains five pounds in muscle in one week. So remember, when you first start, you are going to gain weight because your muscles, like mine, probably are not prepared for the unrelenting pummeling you are about to do to them. They are going to freak out, they are going to hurt unlike anything you can imagine, and they are going to retain bum-loads of fluids for at least a week. This is going to make you want to throw the scale out the window and quit the program but I swear to you it goes away! Most people get over the soreness in the first couple of days, but I did not get over it until about day 12. And when the muscle soreness decreased the extra water weight also went down. I'm a girl, I understand the concept of water retention, but the extent to which I experienced it with Insanity was Baananaaas. I just don't want you to get discouraged and give up before you even really get started. You can feel yourself getting stronger and healthier in just the first few days. I've been reading Insanity threads like crack trying to keep motivated and now I am finally contributing my own because, thank-you-my-lucky-stars, I finally weigh less today!!! SCoRE!