Have you ever been out for a run and thought Dude...I am beat to snot! ? Whether you have or haven t, come on out for the toughest 52k trail running race in North America (according to my limited research - based on elevation gain/loss only)! We don t have any mountains around here, but we have hills that add up to some serious elevation gain. 14,000ish+ feet to be somewhat exact...in only 52k! Google Earth says somewhere between 1056m-1080m of gain per lap (3465 -3543 ) and my Suunto Ambit says somewhere between 1100m-1180m of gain per lap (3608 -3871 ). This is climbing only, not a combined gain/loss! :) Four 13k laps on this course yield staggering numbers...and legs.