my uncle was a paraplegic and used to teach monoskiing at attitash. I got to try biskiing (monoski with two skis) once and it was fucking hard. I was being tethered and had two skis and still couldnt stay up. Gotta give props to them...
The thing about most of these monoskiers at least from my experiences - theyre fucking nuts. They break something ski diving or in some other gnarly sport and then they turn to monoskiing. These guys aren't really afraid of anything.
props to that guy for attempting a backflip. must be insanely hard.