Podcast Guest
Zach Bitter
About Zach
Zach Bitter is an American ultramarathon runner known for setting world records in the 100-mile run and the 12-hour run on track. He achieved these records during the Six Days in the Dome event in Milwaukee, Wisconsin, on August 24, 2019. His 100-mile time of 11 hours, 19 minutes, and 13 seconds surpassed the previous world record held by Oleg Kharitonov by nearly 11 minutes. This performance also beat his own American record of 11 hours, 40 minutes, and 55 seconds. Following the record in the 100-mile event, Bitter continued running for an additional 40 minutes to extend his 12-hour distance record to 104.8 miles, improving the previous mark by more than three miles. His 12-hour record was later surpassed by Lithuanian Aleksandr Sorokin in January 2022. Bitter attended the University of Wisconsin - Stevens Point from 2005 to 2008, where he was a member of the Track and Field and Cross Country teams. During his collegiate career, he was a top five runner on the men's cross-country team, recorded a personal best of 26 minutes and 34 seconds in the 8k, and competed in indoor and outdoor track and field, achieving a personal best of 9 minutes and 23 seconds in the 3000-meter run. He has stated that his experience at UW-SP influenced his progression into ultramarathon running, noting that he improved with longer distances.
Summary based on Wikipedia, available under CC BY-SA.
Latest interviews
Every podcast episode Zach Bitter has appeared on, newest first.
The People Run Podcast
#49 How Zach Bitter Thinks About Training
Jun 4, 2026
Becoming Ultra
"The Art Of Ultrarunning" with Ian Sharman
Apr 30, 2026
The Eat for Endurance Podcast
Why Zach Bitter Went High Carb After 14 Years of Low Carb Fueling
Feb 19, 2026
The Strength Running Podcast
American Record Holder Zach Bitter on Carb Experiments, DNF's, and Learning From Failure
Jan 8, 2026
Uphill Athlete Podcast
Training for Speed and Longevity with World Record Holder Zach Bitter
Jul 8, 2025
N1 Fitness Podcast: Sustainable Fat Loss for Busy People
298: Nutrition For Runners w/ Zach Bitter
Jun 2, 2025
Physiologically Speaking
Marathon Training Q&A
Apr 26, 2025
The Clinician's Corner
#11: Endurance Training Redefined with Zach Bitter
Jul 23, 2024
Speaks about
Topics hosts book Zach to cover, drawn from the episodes where they appear.
Appeared On
Browse the full historical catalogue of shows that have previously hosted Zach.
Guests who appear alongside
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