I did that fake rock climbing at a carnival one time...I did the beginner one easy, I made it through the intermediate one alright, but I only made it about half way up the hard one...the next day my entire upper body, as well as my hands and fingers were hurtin' pretty bad!!! I had no idea how rough that is on the body!
Yeah its definitely tough. I learned to climb with hiking bits than used actually climbing shoes... what a difference. My buddy who taught me only free climbed. The following year he took a bad fall broke his back legs and much more.
I had to watch it quite a few times, because I almost couldn't believe it was real. How did he not fall forward and off the wall when he flipped upside down? Just push yourself away from the wall a little bit and gravity would do the rest.