Arizona RepublicView CommentsThere's no better place to chase a world record than your own home, especially in quarantine mode during the COVID-19 pandemic.That's exactly what Phoenix ultramarathon runner Zach Bitter will be doing as he attempts to break the 100-mile treadmill running world record Saturday, 6:30 a.m. to 7 p.m., streaming live on his."I had my eye on some treadmill stuff in the past just because I thought it was an interesting concept, and I thought, well, now is probably the best time to do it," Bitter said. "I translated my training from...…Arizona RepublicView CommentsThere's no better place to chase a world record than your own home, especially in quarantine mode during the COVID-19 pandemic.That's exactly what Phoenix ultramarathon runner Zach Bitter will be doing as he attempts to break the 100-mile treadmill running world record Saturday, 6:30 a.m. to 7 p.m., streaming live on his."I had my eye on some treadmill stuff in the past just because I thought it was an interesting concept, and I thought, well, now is probably the best time to do it," Bitter said. "I translated my training from...WW…