Martial Arts?
Surprised there were no combat oriented sports other than wrestling in the video, boxing for example is sport where it is a guarantee and a goal to hit your opponent preferably knocking them unconscious. The same with MMA in which some brands a fight can be finished with a soccer style kick to the head. I would also like to see how choking or strangling a person unconscious can effect the brain. We know it can kill but how close to the line are some of these fights?