Zach Bitter

Zach Bitter is an American ultramarathon runner who held world records for the 100-mile run on a track and the 12-hour run on a track. He set both at the Six Days in the Dome event in Milwaukee, Wisconsin, on August 24, 2019, covering 100 miles in 11 hours, 19 minutes and 13 seconds, almost eleven minutes faster than Oleg Kharitonov's 2002 world record and more than 20 minutes faster than his own American mark. He then kept running for another 40 minutes and extended his 12-hour distance record to 104.8 miles, which Lithuanian Aleksandr Sorokin beat in January 2022. Bitter attended the University of Wisconsin - Stevens Point from 2005 to 2008, where he ran on the cross country and track teams, and he has said that he seemed to get better as the distances got longer.