Jeffrey Silvers is a 54 year old runner from Toronto, Canada.  For several years his goal has been to qualify for the Boston Marathon. He ran his first marathon in 2013 in 4 hours and 12 minutes. Over the years he improved, but he also experienced several serious medical challenges that set him back in his training and racing.  He started implementing low HR training and increased his volume, which helped improve his running a lot. We take a deep dive into his training and racing to qualify for Boston