Filmmaker Isaiah Jay followed four runners from The Adrenalin Project as they tackled the iconic Leadville 100 on Aug. 20-21.
In July, Andrew Miller became the youngest person to win the Western States 100 at 20 years old and continues to improve.
A 12-minute documentary about Wally Hesseltine's quest to become the oldest Western States 100 finisher.
For Karen Hanke, trails are for both training and inspiration for her job as a children’s book illustrator.
Scenes from the Tamalpa Headlands 50K that took place on Aug. 28 near San Francisco.
Ultrarunner Joe Grant has set a new self-supported record for biking to and running up all 57 of Colorado's 14,000-foot peaks.
A look at how this 27-year-old Nike Trail Elite runner lives and trains in a cabin in the woods halfway up Colorado's Pikes Peak.
The ultra-running legend known as "Speedgoat" is fighting to stay on pace.
The 30-year-old trail runner ran up and down the 14,115-foot mountain four times and accumulated 100 miles of running.
Inspiring images from Ethiopia's Rift Valley.