This little video was found in archives of a friend. It is a commercial that Reebok never aired due to safety reasons. The guy in the commercial is Albert Stalk, Kahnawake peacekeeper and iron worker. They hired him to do the commercial in 1990 due to his incredible capabilities of freely running on steel structures. The safety inspectors had him on a line and it was making him stumble, when they where not looking, he took the line off and told the guys to shoot. That is the result of what you see, but safety inspectors never approved the commercial.
I wonder if dude really did do that shit without the line. If so, then that's badass. When I was on a structure(practice structure inside of a building), I could barely walk on them beams. I can climb around on them real good, but walking on top of the structure is something else.