Sumo wrestling isn't part of the Tokyo Games, but its storied arena is lending Olympic boxing a little of the flavor of Japan's 1,500-year-old national sport.
Boxing bouts are taking place at the legendary Kokugikan Arena, a 7,300 seat stadium described by Olympic organizers as the "spiritual home" of sumo.
Sumo sees two massive, nearly naked wrestlers grapple on a raised ring floored with clay and edged with hay bales. The winner is usually the wrestler who topples or knocks his opponent out of the ring.