An excellent point to make. Judo was (is still?) part of the PE program in every Japanese school from grade 1 through 12. The kidlets start learning to fall on Day One of that class. Of course I'm sure that this was a mere coincidence that Jigoro Kano (the guy of the Samurai class who systematized Judo from several styles of Jujitsu [or however one chooses to spell it]) was the national minister of education.