True story: My younger brother didn't play a lick of football before his Junior or Senior year of High School (I honestly don't remember which). He ended up in the ER after practice one day. I played before high school and never had that happen to me. Was it coincidence? Maybe. I do know that I was never timid and didn't shy away from hits. His first step was ALWAYS backwards and he didn't like hitting. I firmly believe that the kids that aren't taught early how to play and how to properly hit and get hit are more likely to get hurt. Of course it can still happen to anybody, but I'll take the better odds.