The benefits are considerable, as only "toshiyori" are allowed to run and coach in sumo stables, known as "heya," and they are also the only former "rikishi" given retirement pay.
Activities for the children include a mini farm, inflatable caterpillar, face painting, bouncy castle, climbing wall, toy library, sumo suits, crafts and all the usual fun of the fayre.
He would sometimes choose not to shave during a tournament for superstitious reasons and would therefore build up stubble, unusual for sumo wrestlers who are normally clean-shaven.
As of today, in most cases these machines are remote-controlled vehicles rather than autonomous robots, although there are exceptions, particularly in the field of robot-sumo.