Yokohama is Japan's second-largest city and a major port city located south of Tokyo, with a population of over 3.7 million people.

Karate, another martial art that originated in Japan, has also become a popular sport and is practiced by millions of people around the world.

Judo, a martial art that emphasizes throws and grappling techniques, was developed in Japan in the late 19th century and has become a popular sport around the world.