Open weight sumo wrestler Olga Davydko glares at her opponent before the start of their match, hoping to up the intimidation factor. Unlike Greco Roman wrestling, which is contested at the Olympics and scored based on performance, sumo wrestlers try to force their opponents to touch the ground with any body part other than the soles of their feet, or push them out of the wrestling ring. Most matches only last a few seconds, but some can last several minutes.
2 of 23Itsuo Inouye/AP
As the referee calls a start, Azumi Okada (right) and Eriko Kawai gaze at each other on the sumo mound.
3 of 23Yoshikazu Tsuno/AFP/Getty Images
Miki Satoyama attempts to flatten her opponent with her body weight.
4 of 23Petra Masova/AP
Klara Janu warms up against American sumo champion Emanuel Yarbrough, who appears to be three times her size. Not much of a warmup for Yarbrough...
5 of 23Yoshikazu Tsuno/AFP/Getty Images
Female sumo wrestler Miki Satoyama stares down her opponent at the 2010 Japan women's sumo championships in a similar manner to a lion stalking its prey.
6 of 23Ethan Miller/Getty Images
Taunia Arave (left) and Heather Colton battle during the U.S. National Sumo Championships.
7 of 23Ethan Miller/Getty Images
Natalie Burns (left) and Taunia Arave engage in the sumo version of a cat fight.
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Natasha Ikejiri (right) tries a new fighting technique in which she smashes her face into her opponent's arm.
9 of 23Ethan Miller/Getty Images
Again, another clever fighting tactic: Natasha Ikejiri appears to headbutt Taunia Arave.
10 of 23Yuriko Nakao/Reuters
Russia's Olesya Kovalenko goes for German Nicole Hehemann's neck at the 2006 world championships in Sakai, western Japan.
11 of 23Wang Yuguo/Xinhua Press/Corbis
Gyongyi Kallo of the Ukraine throws her opponent to the floor.
12 of 23Oliver Killig/EPA
Erika Makai of Hungary tries to rearrange the face of Ekaterina Kevb of Russia.
13 of 23Noriko Yamaguchi/Reuters
Female sumo wrestlers roll on the ground as a seemingly-indifferent judge watches over them.
14 of 23Yoshikazu Tsuno/AFP/Getty Images
While these two seem to be hugging it out, they're actually still brawling.
15 of 23Yoshikazu Tsuno/AFP/Getty Images
These middleweights prove you don't have to resemble an elephant to be a sumo wrestler.
16 of 23Janek Skarzynski/AFP/Getty Images
These amateurs are training to be the next generation of sumo wrestlers.
17 of 23ALEXANDER NEMENOV/AFP/Getty Images
Veronica Kozlovskaya of Belarus stares down Maria Van Den Brink with the intensity of a tiger and the stance of a frog.
18 of 23Patrik Stollarz/AFP/Getty Images
Luciana Watanabe of Brazil takes down Alina Boykova of Ukraine.
19 of 23Patrik Stollarz/AFP/Getty Images
Nicole Hehemann (right) of Germany attempts to rip off Russia's Svetlana Panteleyeva's mawashi, the formal name of the loin cloths they wear.
20 of 23Patrik Stollarz/AFP/Getty Images
Rie Tsuihiji of Japan prepares to face Ekatarina Keyb of Russia.
21 of 23Patrik Stollarz/AFP/Getty Images
Katherine Hurley of the U.S. bypasses normal fighting techniques and strikes straight at the throat of Germany's Steffi Mueller.
22 of 23Julian Finney/Getty Images
Adele Jones (left), Steve Pateman, president of the British Sumo Federation, and Becky 'Pink' Williams channel their inner wrestler.
23 of 23Koichi Kamoshida/Getty Images
Auua Zhigalova of Russia throws down Adele Jones of England during their match.
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