I have been lurking for about a month. I finally got sick of being way overwight (6' 1" and 329 pounds) and decided it was time to do somehting about it. My family is very competitive, so I challenged everybody else in my extended family to go along with me and see how much weight we could lose this year. I knew that changing my eating habits alone was not going to do it, so I had to find some sort of excercise that would do the trick. I turned to my old youth size department store mountain bike that was sitting in the garage collecting dust. It turns out that it does an amazing job of burning calories. I have lost 32 pounds since January 1, and the six other people in my family that have joined me have lost a good bit as well. We are currently at a total weight loss of 141 pounds. I am up to weekend rides of 20 miles (I started at 4 miles) and am currently shopping for a road bike.