Details on routes, weather, fuel, and gear for tackling the rim-to-rim-to-rim challenge

Impossible is an upcoming documentary from Upslope Productions that follows five athletes as they take on La Ultra, a 333-kilometer ultramarathon with a 72-hour cutoff. The single-stage race crosses through the Ladakh region of the Indian Himalayas and presents an unforgiving environment. This trailer…

Plug in your headphones and get ready to binge. These podcasts give ‘Serial’ a run for its money.

You’ve probably never heard of the Ecuadorian, but he’s behind the force behind the speed records on some of the world’s highest peaks

Everything you need to know about ultrarunning's ultimate gateway drug

The runner was a well loved member of the community

Chasing the Distance, a film from Tandem Still + Motion and the Sierra Club, is a look at the lives of ultrarunning athletes Rob Krar and Christina Bauer. Krar, who holds the FKT on the Grand Canyon Rim to Rim to Rim run, and Bauer share…

Can an unknown long distance runner beat the 35-year-old record for the fastest cross-country traverse?

James Lawrence ran 50 Ironman-distance triathlons in 50 States in 50 days, and still managed to parent his five kids. How the hell did he do it?

The ultrarunner has a long history with the land surrounding Grand Canyon National Park. Now he's pushing to grant it official protections.

This clip is the opening scene of Outside Voices, a new film from Joel Wolpert about the life of ultrarunner Jenn Shelton. Shelton, best known for her part in the book Born to Run, lives in a small van known as “Hi-C” and travels the Mountain West spreading her…

The North Face Endurance Challenge Championships in San Francisco, California, is quickly becoming one of the most most competitive races in the country.

The first-ever documentary about the notorious ultramarathon was just as secretive and nearly as difficult to complete as the race itself

How to push your body to the limit and make the podium

This fall, world-renowned ultrarunners Mike Wolfe and Mike Foote partnered with photographer Steven Gnam to run across some of the highest, wildest mountain ranges in the Lower 48, with as little gear as they could get away with.

Cycling and track athletes cause a stir when they're caught cheating—but in smaller (and less well-funded) arenas, others may be getting away with it

A user's list for all the travel, fun, and affiliated delights you can cram into a year

What motivates an amateur racer to rack up thousands of training miles and take on the pain and tedium of marathons and ultramarathons? Sometimes it's about keeping a step ahead of your ghosts.

Ultra coaches Eric Orton and Jason Koop on the importance of strength and speed over mileage

What gear do runners like? How do they train? How obsessed are they? Surveyers showed up to the Western States Endurance Run and simply asked

The ultrarunner’s speed record on the Appalachian Trail has been overshadowed by claims that he's contributing to the commercialization of wild places. After accepting a $500 fine for public drinking as part of a plea deal, Jurek speaks out against his critics.

105 miles and 30,000 feet of vert make this race one of, if not the hardest on earth.

Everything you need to know about training under tricky circumstances and winning big European mountain races

But don't worry—a stateside version of Europe's grueling Skyrunning series is ready to kick your ass

A primer from overall winner of the Canadian Death Race, Alissa St. Laurent

For some, an ultramarathon can be close to a religious experience. For all, it will undoubtedly be one of the most ridiculous things you can put your body through, as evidenced by our organ-by-organ breakdown.

The ultrarunner set a new record on the AT and found himself at the center of a debate about how we should use the wilderness

Athletic training and parenthood aren’t mutually exclusive. In fact, when done right, they go hand in hand.

The nature and brutality of these races makes the double-header particularly compelling

A group of ten ultrarunners attempted to chase down a pronghorn antelope in Northern New Mexico to answer the question of how humans evolved with a remarkable capacity for endurance running

The secrets behind the 40-year old Catalan ultrarunner’s winning streak

Four ways to avoid a potentially dangerous inflammatory response

Over the past decade, ultrarunning has gone from a fringe pursuit for distance freaks to a hypercompetitive sport attracting big-time sponsors. But a mysterious training condition is suddenly plaguing its ranks, robbing a generation of top athletes of their talents and forcing victims to wonder: Is it possible to love this sport too much?

In the grueling world of ultrarunning, she's an anomaly: a low-key athlete who thrives on unstructured training, competes by instinct, and crushes men in the sport's most prestigious race

Despite growing popularity, the much-talked-about sport remains on the fringes of the endurance world.

Listen up, newbies! The ‘Born to Run’ star learned some stuff the hard way so you don’t have to

Sir Ranulph Fiennes reflects on the life of a 71-year-old explorer as he stares down the barrel of one of the planet’s hardest ultramarathons.

Two friends go on an annual adventure. This year, it’s in New Zealand, and we’ll be there every step of the way.

A flashlight, a fitness tracker, a GPS...the list goes on.

A new algorithm might be the key to never having a bad race again.

Forget the forecast. This gear will keep you moving through the toughest season.

A purpose-made shoe for your next (or first) FKT

Like any wilderness mission, trail running requires savvy prep and the right equipment. Pack your bag wisely.

Our drive to raise billions annually is a crazy effective performance enhancer.

Tips for developing a rock-hard core from the two-time Ultra-Trail du Mont-Blanc winner

With warp-speed ascents that include the Matterhorn (1:56) and Denali (9:43), ultrarunner turned alpinist Kilian Jornet Burgada is the king of the endurance world's latest obsession: fastest known times. And now he plans to run up Everest.

Inspired by an infamous assassin's escape from prison, the Barkley Marathons just might be the toughest race on the planet: a 100-mile-long, unsupported slog through the Tennessee backcountry that only 14 people have ever finished. Madison Kahn spoke to three of the event's regulars to get the story behind the Barkley.