people can get concussions if they want, natural selection. JK, on a real note, the definition of sport is "an activity involving physical exertion and skill in which an individual or team competes against another or others for entertainment", so as long as whoever is participating is doing it for fun and having fun it's fine.
YES, concussion can be serious! I have had a concussion when I was playing football in 2017. You really can’t treat it, well i don’t know because I didn’t go to the ER. But I slept through the concussion and had multiple headache since then
