Check out the amazing photos from this technical trail running and rock climbing event in Boulder, Colo.
This outdoor festival included plenty of trail running opportunities throughout the day and night.
A closer look at one of the world's steepest trails.
We profile this one-of-a-kind trail with sweeping views and a ridiculous steep grade.
More than 7,250 runners tackled one of the five races during UTMB week that ranged in length between 50K and 300K.
The training involved for a mountain race is like a bag of trail mix with a little bit of everything thrown in.
The 24-year-old is looking forward to mixing it up with some of the best trail runners in the country on Saturday.
We tested 12 of the summer's best new trail shoes on all types of terrain to help you find your perfect match.
One of the most iconic trails in the United States is a great challenge for runners—with great rewards.
Get a better idea of what kind of snakes lurk on the trails.