Want to chart the history of martial arts training (and exploitation media) in the U.S.? Just look at the ads that ran in comic books. They went from Judo to Karate to Kung-Fu to Ninja, decade by decade, always promising deadly secrets revealed and skills that would keep you from getting sand kicked in your face on the beach.
Here’s some great ninja ads, from a very nice write up at the blog of Mr. Dan Kelly.
Gotta get me some of them there Physio-Mental Powers!