This is an educational website focusing on how to maximize long-distance performance and is published by Phil Weiser, PhD, FACSM (Emeritus). It explores the factors that limit endurance sports, the mechanisms that result in these factors, and ways improve your personal endurance performance. This site will be concentrating on middle- to long-distance running and cycling events. Phil is an experienced runner who has run a mile in 4 minutes 15 seconds and a marathon in 2 hours 29 minutes.