“The reasons for the success of Japanese martial arts in the west,” by Guillaume Erard

[W]e could even argue that Japanese martial arts represented a journey back to the source of what real sport ought to be. Of course, in addition to the purely physical appeal, the gentlemanly character of the fighters of that time was drawn to the slightly egocentric considerations of perfection and self-improvement carried by budo.”

“[T]here is an obvious protectionism operated by the Japanese regarding the transmission of their secrets, especially regarding warfare. Even within Japan, the transmission of the secret fighting techniques within the koryu (古流) was very restricted and selective.”

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