That image is one of the stock images that came with the site template. I decided to keep it when I was adapting the template because, as you said, it is a great picture. There were a few more pictures, but this was, in my opinion, the best one.
Anyone know who the two guys wrestling in the backdrop on the homepage are? It's such a great picture, I feel it's perfect for this site. But often wonder who they are, and where they are now? or if they were ever members of this site?