I was morbidly obese, and I knew I needed to make a change or else I wasn't going to be around much longer. I just found the motivation somehow, and made the change. Initially, I crash dieted from around 330lbs to 310lbs in a month until I hit a plateau. I was eating about 1200 calories per day. Then I started reading about body building, and its role in fat loss. It just made the most sense to me, so I bought some equipment and started eating more. I haven't looked back, and hopefully I never will.

Too many reasons to list here...great energy, feel better, look better, etc. etc.