At my boxing gym every few months some kid would show up and after a week he would be much better than everybody else. These guys just understood the sport immediately and also had physical ability. A lot of these guys dropped out but if this level of talent meets with interest and work ethic then you get super athletes like Michael Jordan or Michael Schumacher in F1.

My ex coach knew sugar ray Leonard pretty well in his youth and he said that Ray started beating up people already in his first day at the gym without having learned boxing technique. He just watched once and knew what to do.