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In page Sumo:

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Life as a wrestler is highly regimented, with rules regulated by the Japan Sumo Association. Most sumo wrestlers are required to live in communal sumo training stables, known in Japanese as heya, where all aspects of their daily lives – from meals to their manner of dress – are dictated by strict tradition. The lifestyle has a negative effect on their health, with sumo wrestlers having a much lower life expectancy than the average Japanese man.[citation needed]