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The Toughest Race in the World, is an Ultramarathon in which only about 35 people are allowed to enter each year. Since some changes were made to the 1989 race, only 20 people finished the course. The fee to enter, if accepted is about $1.60, plus a small purchase of a license. For some other interesting aspects of that race see: https://www.bbc.com/news/uk-scotland-edinburgh-east-fife-68643341 and https://www.bbc.com/sport/athletics/47040763?src_origin=BBCS_BBC