Mixed martial arts was invented by Brazilians, whose families had been trained by the Japanese. Those Brazilians came to the U.S., where their invention was bought out, gussied up and presented to the world, which found it good. ↗
I knew nothing about martial arts. And I don't really like it! But in the film, I not only had to pretend that I knew all about it, I had to be the best at it. That was very difficult. ↗