All their lives, starting when they are admitted to a stable at about age 13.
They get accepted into a sumo stable. Once there they train for many years and begin their trip up through the ranks.
This depends on the sumo wrestler and wrestler in question. However, it can generally be agreed that sumo wrestlers are stronger. (However, many recreational/amateur sumo wrestlers are not strong)
Most of them live in Japan. Sumo wrestlers live in a 'stable' where they train and live. They will spend most of their day in the stable eating, training and sleeping.
One of the oldest and most respected is the Tomozuna stable .
It provides a place to eat, sleep and train. Food is plentiful to help them gain weight. They train with the others in their stable so there are always training partners. The stable provides them with all the necessities they need.
Anyone can become a sumo wrestler. The first step is to be accepted into a sumo stable, a sort of club or commune where you live and train. You can enter a stable at a young age, as young as 13.
Sumo is a Japanese sport. There are Chinese sumo wrestlers.
it is impossible to calculate the number of sumo wrestlers because there is always new ones.
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There are Chinese Sumo wrestlers. Those that make the most money are wrestling in Japan.
YES Sumo wrestlers in ancient japan. Japanese sumo's opened there mouths and swallowed the flies that were on there faces
No, there are no weight classes in sumo. So a wrestler can be matched up with someone who is much heavier. That is why weight gain is so important in sumo training.