Hahaha, my partner skates concrete and it is absolutely the most insane material to skate on. Although I suppose it was the only material for the longest. But there's others that she vouches don't hurt as much (as long as you're not falling straight down). But I knew a guy who got the skin ripped off his hand and was insanely lucky for having a tool belt on because he got someone's attention and they stopped the machine that was pulling him in.