swivel. imagine if system sam is running the ball, damien, stand here. if i m trying to tackle sam, sam, why don t you run that way. if i m looking at sam, sometimes i don t see that there is a blocker coming at me. that could be really dangerous. so it s important to teach these young men to have good peripheral vision, even though with a child it is hard tore have good peripheral vision. so i see him if he doesn t blind side me. brian: because the shot you don t see you can t brace for. that s right. that s why strength is so important. elisabeth: odont be a bobble don t be a bobble head. kids are bobble heads. if you look at young kids, your skull is full size by the time you re five years old. so it doesn t take much of a hit to make their heads move really far. we found 7-year-olds actually get as much brain trauma as college football players because of those big heads. so what you want to do is strengthen their neck. we have a great program on concussion checklist.org t