Wrestlers belong to teams, and live, eat and train together.
Children start classes very young. If they're good they're promoted to a school, called a sumo stable, when they are 15-years-old. There they dedicate themselves to the sport.
Sumo fighters make sure they eat lots of meals a day, including lots of noodles, rice, meat and fish, all cooked so they are high in fat.
They make sure they get plenty of rest during the day while they're not training, often eating a meal before going to sleep, then eating another meal as soon as they wake up.
Young sumo wrestlers are taught about wisdom, spirituality and the importance of being true to yourself. Training to be a sumo wrestler is almost like training to be a priest or a monk.
Trainees have to do lots of work around the training school, including cleaning the house and massaging the older sumos.