Frederic Sabater Pastor is a Postdoctoral Researcher at the Inter-university Lab of Human Movement. His area of focus is running, trail, performance, physiology, and fatigue.Paper on physiological variables related to ultramarathon performance.Previous papers on the subject- Physiological Determinants of Ultramarathon Trail-Running PerformancePredicting Trail-Running Performance With Laboratory Exercise Tests and Field-Based ResultsFrederic on TwitterBuy Koop’s new book on Amazon or AudibleInformation on coaching-www.trainright.comKoop’s Social MediaTwitter/Instagram- @jasonkoop