Who do not know the Sumo (相撲 )?? The most well know martial art in Japan.
There are six Grand Sumo tournaments each year, and tree of them are held in Ryōgoku, Tokyo, on the Ryōgoku Kokugikan in January, May and September. So if you have the chance to go, do not hesitate 😉
Enjoy the Video.. better then 100 words: (watch in 720p and full screen to fully appreciate)
and a selection of picture used on this video: