Concussion is about football but obviously fighting has it too. I mean look at all the retired boxers with Alzheimer. At the end of the day, they know what they getting into and it's their choice. Judo/bjj gets arthritis and messed up fingers. MMA fighters probably gets the worst especially with those baby gloves. Again, it's their choice.
As for the movie, I actually loved it. I didn't really want to watch it after reading the synopsis but everything else seems worst so I gave it a try. And boy did I like the movie. Will Smith was great. I learned a lot. Racist money hogging NFL execs. I find it amazing how recent this event was and how ignorant Americans are. I was never a fan of football and this movie made me hate football even more. NFL execs and American football fans are the worst. I love watching them fight in the parking lot over their team or jersey. Ignorant football loving muricans.
If you haven't watched, you should watch it to see how ignorant and greedy Americans are.