Well my little brother (he's 13) is doing ninjutsu.
The grandmaster is Masaaki Hatsumi , the founder of the Bujinkan Organization, however the dojo my brother attends is not teaching how to be a ninja (creeping through shadows etc), but they're teaching some techniques of the ninja (don't as me any details, I have no clue what actually is historically a ninja technique or what has been ...