Voyage à la Lune / Library of CongressThere are all kinds of athletic equipment for the disabled. At my rehab hospital, they had bikes that didn't need arms to steer. They were recumbent bikes, where you just wiggled your hips to steer, right or left, like a disco dancer. There was a dock where patients could check out modified boats and paddle up and down the river. Paralyzed? You can still windsurf.