If you enjoy gorgeous scenery and grueling but exhilarating endurance races, and you're in shape for it, this weekend's Aspen Back Country Marathon is the event for you! Boasting spectacular views of the Elk Mountains and the city of Aspen, the Aspen Backcountry Marathon & Half Marathon is run almost exclusively on high country dirt trails. Challenging ascents, exciting descents and wide diversity in terrain will challenge even the most well trained athlete. Both the full marathon and half marathon will begin in downtown Aspen and end in Rio Grande Park. To register, visit aspenbackcountrymarathon.com.