Shidoshi Frank Dux, Dux Ryu Ninjitsu derived from the Yagyu Ryu school ...

Shidoshi Frank W Dux inspiration to the movie bloodsport, and a grandmaster of the Tanaka Ryu line of Koga Yamabushi Ryu Ninjutsu explains why he evolved into Dux Ryu and that his school has roots in the Japanese school of Yagyu Shinkage Ryu , a school of swordmanship of the old Samurai of the ancient Japan...