Beyond the 80/20 Rule: Why Zone 3 Training Might Deliver Superior Endurance Results

According to groundbreaking research by Stephen Seiler and Espen Tønnessen, analyzing over 15,000 training sessions from world champion endurance athletes, elite athletes actually train 85 percent at low to moderate intensity.  That’s the origin of the 80-20 or 85-15 “rule.”  More importantly, they found that training distribution varies significantly based on: However, this study is […]