Can someone help me? I coach the line my kids are 6-8.Our head coach insist on takeing our kids down to the sled and left and right shoulder block.I prefer the step ,punch,and drive style blocking.First off i feel its a waist of time the kids cant move the sled if they stay square but if they turn to the side which we all no is wrong because liemen must stay square to block they move the sled a few inches.Some kids say there back hurts when they hit the sled and one kid cried that he hurt his back.I just cant get through to our head coach that they are not old enough for the sled my opinion is somewere between the ages 11-13 there ready and strong enough to hit and drive the sled but that is my opinion can i please get some more ?