Backyard ultra is a form of ultramarathon race where competitors must consecutively run the distance of 6706 meters (4.167 miles) in less than one hour. When each "yard" is completed, the remaining time within the hour is typically used to recover for the next hour’s race. - from Backyard Ultra
24 "yards" is equivalent to 100miles
The course will be marked for day and night racing and all racers must stay on the designated trails.
