Shigeru So is a Japanese retired long-distance runner who represented his native country at two Summer Olympics: 1976 and 1984. He won the 1985 edition of the Tokyo Marathon. His twin brother Takeshi So is also a retired Olympic marathoner, and finished fourth in Los Angeles, California (1984). Both Shigeru So and his twin brother Takeshi So were known for attending training camps in New Zealand, including at Mount Taranaki. Shigeru So (Japan) set the men's marathon world record of 2:09:05.6 in Beppu-Ōita Marathon on February 5, 1978. It stood 2.2 years, until Gerard Nijboer's 2:09:01 on April 26, 1980. Wiki link