Karl ‘SpeedGoat’ Meltzer, a legend in the ultramarathon world shares the mental approach that helped him achieve the title of ‘Winningest 100-mile runner on the earth’, having won 38x 100 mile races. Karl describes his most recent challenge: Thru-hiking the Appalachian Trail in record time as: “Not only man versus clock, but man versus nature...and man versus self".