kids are too soft now. half of the things we used to play with would never be allowed on a modern playground.
the elementary school I went to had monkey bars like eight feet above concrete, so there was an added incentive not to fall. I saw some a few months back where kids could drag their feet on the ground. where is the danger in hanging upside down on that? kids in the yard used to break all sorts of bones jumping from the gigantic swings we used to have. the airtime was fantastic on those, and I doubt those are around now. but it was fun!
also, when I was young, almost every playground had a sharp, rusty spike grounded in cement where some tetherball used to be. "jump the spike" probably isn't around either, and that's just cheating children out of their youth. :'(