Sumo wrestlers actually are very muscular, however, it's not lean muscle like you see a lot of WWE superstars, or UFC fighters having. Instead, that muscle is covered by a lot of fat. If a sumo were to become lean muscular, that would involve shedding the excess fat, and therefore, weight. In a competition that involves using your own body to push (wrestle) another person out of the edge of the ring, having more bodyweight is an extra asset, atop of your technique. Sumo wrestling is generally less technical than other forms of wrestling, like Greco Roman (though I'm not taking anything away from sumo wrestling), and as such, instead of focussing on different types of takedowns, and holds, sumos focus primarily on their size, and stability.
Generally, to win a sumo match is done one of two ways: 1) To overpower your opponent using your size and strength or 2) By finding a way to throw off your opponent's balance. If you are bigger, and heavier, it is much harder to be beaten with straight up strength, or to have your balance exploited.
· 6 years ago