Physics Greg News Today

News and youve been on to talk with us about concussions. >> sure. jenna: a lot of talk about players getting bigger, faster, stronger even at aing young age and that could contribute some say to the tough injuries were seeing including the rise in concussions. do you have any concern about that? >> no. actually, players are training, there are different methods of training. there is more specific methods to train what your sport is but its not that the speed of the nfl has gotten faster. its th...