let's discuss the construction of a sumo wrestling doyo a circular platform made of clay and sand with a diameter of approximately 4.5 M the dojo features a ra toara to prevent wrestlers from falling out to ensure stability and evenness the clay mixture is mixed with sand and water forming a circular Sun shape this is covered with a straw mat the shiky fu providing a soft surface for wrestling Suma wrestling a tradition since over 1,500 years symbolizes respect tradition and history