I’m not so sure that wing walking would qualify as a sport as much as it is a stunt, but it’s certainly “extreme”. Some people do refer to it as an extreme sport and it’s extremely dangerous, so it made the list. Wing walking is the act of walking out onto a wing of an airplane while it’s in the air. This actually didn’t start as a sport, but as a necessity as the first wing walker, Omer Locklear walked out on a wing with the airplane in flight during World War I to repair some damage.I guess after that, people saw it or heard about it and said, “Hey wouldn’t that be fun”. Hell, no! But we have enough crazies that do think it’s fun and it doesn’t stop the rest of us from watching. We now see wing walkers at air shows doing stunts such as handstands and hanging by their teeth!