- “It became clear to me that the phenomenon of subconcussive hits must be endemic to the game. When an offensive lineman hits a defensive lineman, the force of that collision has a stunning effect that alters brain chemistry. No one talks about the damage that occurs play by play, game by game. If a player starts in high school, continues in college, and then practices and plays sixteen games a season in a long NFL career, with an average of 70 offensive snaps a game, it is possible he will leave football with 10,000 subconcussive hits. None of those hits might knock him out, or even be recorded as a concussion, but the cumulative impact must be staggering. More frightening is the fact that this danger exists in any sport that has collisions: hockey, baseball, field hockey, boxing, MMA, cycling, even youth soccer.” The Agent: My 40-Year Career Making Deals and Changing the Game (Steinberg, Leigh;Arkush, Michael)–page 203