You could say "nuts" about a lot of athletes. A guy catches a kickoff and begins to run as hard as he can in a direction with 11 men headed toward him running as hard as they can with the intention of hitting him as hard as they possible can. Then after taking that hit, he gets up (hopefully) goes back to the sideline and waits his next chance to do it all over again.Cross country runners are nuts. The elite ones push themselves to the point of breaking every single time they run a race.
I have seen this a few times in CC. Other sports don't allow players concussed/suspected concussed to continue these days, not sure why CC allows runners definitely compromised to keep risking a serious injury.