Zach Bitter is an endurance athlete, ultra-marathon runner and coach. He recently broke 2 world records in running: 100-mile (11:19:18) and the 12-Hour record (104.88 miles).Zach Bitter is an endurance athlete, ultra-marathon runner and coach. He recently broke 2 world records in running: 100-mile (11:19:18) and the 12-Hour record (104.88 miles).Zach Bitter is an endurance athlete, ultra-marathon runner and coach. He recently broke 2 world records in running: 100-mile (11:19:18) and the 12-Hour record (104.88 miles).