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A new documentary follows two Western athletes as they travel to the Hermit Kingdom to participate in its only sporting event open to foreigners

The siblings essentially crossed finish lines together in high school track. Moving far apart and facing their own demons, they found that the bond of running holds fast.

Everyone can find a pair that fits perfectly, whether you prefer compression, roomy cuts, full coverage, or a barely there fit

The OSR10K in New York City is setting the standard for unsanctioned racing

Flexible, strong hamstrings are happy hamstrings

It’s a lot of travel for little reward

The IAAF World Championships are happening when the season should already be over

He's literally tested hundreds of hats, and this is his go-to

Unsurprisingly, the implications of this debate ripple far beyond the sport

Two years after his disputed back-to-back summit of the world's tallest mountain, alpinist and ultrarunner Kilian Jornet has received a permit to climb Everest again this fall. If he plans to go for another record, he's not telling people.

The physiological and psychological responses to different types of interval workout depend on the details

Pack these essentials to keep up your workout routine—no matter where you go

A historical analysis of world-record pacing suggests that beating your own best time can be complicated

By offering minimal prize money, the sport’s most prestigious race might be excluding the best runners

Warm-up exercises are essential for priming your body prior to any workout, especially running

Hint: it's about introducing just the right amount of chaos

Yes, raw speed helps. But it isn’t everything.

This weekend, the world’s best mountain runner sets his sights on Pikes Peak

We tested three new kicks that incorporate the controversial feature

Eight one-of-a-kind events for those who aren't into the standard swim, bike, run

Six cotton-based t-shirts for next-level comfort

Scientists debate the physiological benefits of ramping up your training intensity or your training volume

When Mirna Valerio first began running ultramarathons, she immediately got a lot of attention—but not for the reasons you might expect

'Leadman: The Dave Mackey Story' chronicles its namesake character making a return to the iconic Leadville 100 ultramarathon

A pair of presentations explore the biomechanics of the controversial shoe, and whether it wards off marathon-induced muscle damage

She's the first person to finish the Leadville Race Series and the Grand Slam of Ultrarunning in a single season

Start-line nerves, finish-line beers, and lots of fast, hard miles in between aren't easy on the gut. Here's what I've learned over a decade of racing.

Kelly Starrett has spent more than a decade training Olympians and professional athletes

Is this the end of her career as an 800-meter runner?

The best ones hit all the notes of lightweight, portability, and (relative) durability

Sweat, lounge, and live in these comfy frocks

We have a lot of opinions about how to make the most of your pit stop, whether you're headed to or from an adventure

One pair to (mostly) rule them all

A new study finds that your “critical speed” threshold drops in the last third of a marathon, which may explain why the distance produces so many blow-ups

And he shows no signs of stopping

This short video features runner Guillaume Peretti on the GR20 trail in Corsica, France, where he once held the fastest known time

The endless tree-lined gravel roads of Vermont provide the perfect setting to log a few miles

I’m not slow. Everyone else is just fast.

With their unsanctioned events, OSR offers a slice of vanishing New York

A simple self-test zeroes in on the most efficient stride rate for your running style

After years in the doghouse, the country’s most talented running team seems to be looking to reinvent itself

The world-champion obstacle course racer has had a 20-year history with anorexia. But now she's in the process of recovering, and she has some important lessons to share.

Who says dystopian climate sci-fi and mountain-survival stories aren't beach reads?

Presenting America’s new adventure capitals

I'm worse at it than your average tortoise, and yet I persist. Why? Miseries and all, there's no better foundation for my physical and mental health.

From tubing to trail running, pro athletes describe the best way to get outside in their hometowns

Expert-tested gear—at a discount

Walmsley just bested his own time by an impressive 20 minutes

After years of empty promises, hydration-tracking wearables are finally close to hitting the market

Loosen up, already. These nine moves offer a full-body stretch designed specifically to offset running.

How I rediscovered the joy of trails and muddy shoes following a skin-cancer scare

That speck, high on the ridgeline, is pastor Sverri Steinholm, who serves as a preacher to the people of his parish and its hospital

Or, the story of how I ate snacks and felt pain

Falls happen. From skiing to bouldering, learn how to do it safely.

The elite competitor and full-time lawyer talks to Tim Ferriss about training and nutrition

The company is growing fast, adding roughly a million users a month, and it has lofty goals to expand far beyond its old identity as a platform for logging rides and runs. Can it succeed?

We sat through the 20-minute molding process, then took them out on dirt to see how they performed

Your head is pounding, your muscles are cramping, and your heart is racing. Then you get dizzy and the vomiting starts. Heatstroke kills thousands of people every year. This is what it feels like—and how to know when you’re in danger.

From plantar fasciitis to blisters, these are the top causes of foot pain for runners

The 44-year-old Ironman competitor wakes up early—and we mean early—and only takes one rest day a month

An inspiration for many, Grunewald showed that it was okay to struggle

Whether you're on burly mountain ridges or buffed singletrack, these kicks have you covered

The history of the oldest women’s-only race is the story of progress, but also of missed opportunities

In 'Running to the Edge,' a new book by New York Times sports editor Matthew Futterman, we learn the fascinating backstory of Bob Larsen, the man who coached Meb to glory

A new study of transcontinental racers pegs the digestive tract as the limiting factor in extreme feats of sustained endurance

Thoughts on a love/hate relationship with an incline

This is a recap of the Nine Trails 35-miler​​​​​​​ in Santa Barbara, California, showcasing some of ultrarunning's top talent

Marc Peruzzi’s recent column about trail work clearly touched a nerve in the running community. Part of his argument is fair criticism, but he got some important things wrong. 

There was something about Primland that made Emily Nunn see red—a lavish and expensive outdoor Xanadu situated near her beloved Virginia hometown. Then she went there and had... a pretty good time. Blame the trout stream and the 400-thread-count linens.

Switzerland’s supreme court has suspended the IAAF’s testosterone regulations

We're no strangers to the suffering that happens during Tennessee's annual Barkley Marathons, but this puts it in perspective

A new startup called Vast Terrain taps U.S. suppliers to make top-shelf goods

Or how running and meditating both led one woman to the same unexpected place

As you get older, setting goals—and reaching them—will look a little different

When you’re in your fourth decade, you’re still young enough to run a personal best. But it’s also the beginning of the end.

Why we name, talk to, and occasionally kiss our gear

We won’t tell you what to think; we’re just here to share the latest data.

You might not like his style, but Sir Mo gives his sport some much-needed attitude

Ötillö Swimrun is a grueling race series alternating long passages of open-water swimming with rugged runs of up to 40 miles. But unlike a triathlon, there’s no biking. That’s great news for W. Hodding Carter, a former collegiate swimmer who plans to qualify for the world championship. At age 56.