Seriously, I salute these guys who don't treat their physical
disabilities as a true disability. In my research for this project
I've come across all sorts of extreme wheelchair sports - skiing,
mountain climbing, mountain wheelchair racing - you name it.
For example, here's a website on wheelchair skiing:
http://www.sitski.com/index.htm
And here's one about a paraplegic, Mark Wellman, who literally
scaled mountains in his wheelchair:
http://www.nolimitstahoe.com/