Training & Performance

Why Ultrarunning Success Is Hard to Predict

Scientists can forecast marathon performance fairly accurately. But for longer distances, things get complicated.

Cycling's Battle for an FKT on White Rim

'Standing Man' chronicles cyclist Payson McElveen's attempt to set a new fastest known time on a loop of White Rim in Utah's Canyonlands.

Your Fear of Reinjury Could Get You Hurt Again

And new research shows it may be one reason why women tear their ACLs more often than men

Even Endurance Athletes Need to Sprint

All-out sprint speed may seem irrelevant in longer events, but new science is making the case for having a “speed reserve”

5 Laws of Sleep for Athletes

At a conference on sports innovation, sleep scientist Charles Samuels cuts through the hype

How Freeskier Jess McMillan Stays in Shape All Year

The world's most successful freeskier and Warren Miller film star says big-mountain fitness starts at home

Mountain Fit

How to Stay Warm When It's Freezing Outside

Keep the cold at bay with these 9 moves that you can do anytime, anywhere

Cody Townsend's Ski Project Almost Broke Him Last Year

Here's what he learned from it