The authors, M. and H. Keller, present the national sport of Japan in this first German-language Sumo book. They explain the rules, ceremonies, and structure of Sumo, and describe the most interesting techniques and popular tournaments. They provide insight into the daily life and environment of Sumo wrestlers and shed light on the medical and social background of this sport. The phenomenon of "Sumo," its close connection to Japanese history and tradition, as well as its strict hierarchy and rigorous performance principles, serve as a key to understanding the Japanese people and their mindset.