Starting at five hours a week, this ten-week program will help you build endurance and jump-start your training this winter

Injury forces ultra legend Scott Jurek off the trail

What is environmental justice, and why should trail runners care?

After an especially brutal winter in Colorado, Independence Pass needs a team of seven heavy-equipment operators, an avalanche forecaster, and a surveillance crew to make the road passable

Four zones have been ranked as extreme on the five-point scale

Bequi Livingston found power and confidence in physical strength. Now she's teaching other women to do the same.

Athletes share their favorite tools for staying hydrated on the move

There are more ways to mess up sun protection than just, you know, forgetting to use it

Ulyana Nadia Horodskyj is an ice scientist who's done research high on Everest—and after working with NASA, she's aiming even higher.