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A general view of competitors swimming over a school of fish at the mass swim start for the 2011 Ford Ironman World Championship on October 8, 2011 at Kailua Bay in Kona, Hawaii. Considered one of the most grueling races in the world, nearly 2,000 competitors must brave 95 degrees temperature and 90 percent humidity to complete a 3.86 km swim, 180.2 km bike, and a 42.2 km marathon with in an 17 hour time cutoff to be called an "Ironman".