Danny Huibregtse improved his marathon times from a 3:59 to a 2:34 using heart rate training. In his last marathon he ran a 34 minute PB from 3:08 down to 2:34, that’s incredible!!  We discuss his training and racing, how he improved so much and recommendations for other athletes looking to improve. Danny has been a part of our Personal Best Training Program and it is exciting to follow all his progress over time. To learn more, check out https://www.PBprogram.com Hope you enjoy this conversati