Fascinating new science out of Stanford University shows trail running can literally change your brain.
The art of skyrunning, through the eyes of its pioneers.
An ultramarathon is more doable than you may think.
On Sept. 26 at the Utah Olympic Park in Park City, Utah, more than 400 hardy athletes and weekend warriors took on the ridiculously
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.