Get the Summary of Matt Fitzgerald's 80/20 Running in 20 minutes. Please note: This is a summary & not the original book. "80/20 Running" by Matt Fitzgerald introduces a training philosophy where 80% of running is at low intensity and 20% at moderate to high intensity. This approach, supported by historical evidence and scientific research, suggests that most runners overtrain at moderate intensity, which is less effective for improving performance. Fitzgerald explains that runners often suffer from "intensity blindness," not realizing they are exerting more effort than necessary...