Yeah, that's the one.
American football requires athleticism, toughness and some violence.
They have some of the fastest running athletes, and some used to run track and field.
Game scoring makes even a single mistake costly
Players regularly get concussions. Every play produces micro-concussions.
The game is very competitive and most players have a short career because a fresh 22 year old has more value than a beat up 28 year old.