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We looked at thousands of data points on Strava to determine what winter habits make for a successful summer season

It turns out you can absorb more carbohydrates than sports nutritionists thought. But does it actually make you faster?

The conventional wisdom is that the body can only absorb certain quantities of protein at once, leading to recommendations of protein spacing that dominate nutrition science. A new study tests a hypothesis centered on a simple question: What if the conventional wisdom is wrong?

The Speed Project underground relay—traditionally run from Los Angeles to Las Vegas—spread its wings this year, going bigger and harder across Chile’s brutal Atacama Desert

You don’t need to be unbreakable to excel at ultramarathons. This lower-volume training plan for advanced athletes shows how you can go really far, really fast, with lower risk.

Coach Stefanie Flippin walks you through how to plan a year of racing specific to you and your goals

Trail running is more than just a sport. For many, it’s an escape, a challenge, and sometimes a relentless quest for personal achievement. But in a realm where boundaries seem limitless, when is enough truly enough? 

In the form of a handy little email, or a push notification, anything to remind me that I'm not heading too quickly towards the afterlife just yet

Every fall, a group of Denver runners celebrates National Taco Day by running 31 miles using the fast food Mexican chain as aid stations

A new study led by ultrarunner Keely Henninger demonstrates complex connections between energy availability, over-dependence on running, and fuel intake on the run.

With strong results on the track and the trails, the Brooks professional has big goals for 2024.

What role do genetics play in athletic performance?

Over the past century, “maximal oxygen uptake” has turned out to be a valuable marker of both endurance and health.

After three-plus hours on the treadmill belting out every song on the Era's tour, I can tell you why Swift's concert training regimen works

The guidelines for returning to training after giving birth are “vague and inconsistent.” That’s no surprise.

Martinus Evans, who goes by @300poundsandrunning on Instagram, didn’t feel at home in the running community. Now, he’s on the cover of magazines, has published a book, and is still running—at his own pace.

Here’s a look at the gear, tech, and media our Outside Run editors loved last month

Ultrarunner Yassine Diboun found his own unique way to help those in recovery move through darkness together. It’s working. 

How to use the winter as a season of regrowth for your best trail running yet.

Our strength running coach recommends occasionally going off-script to reach your running goals

Writers share what their creative practice has in common with physical exercise

Everyone talks about the need for a strong mileage base, but it’s also important to build a solid nutritional base

From ultra-fast, carbon-plated road racing shoes to light and agile trail runners, here’s a glimpse of 14 of the coolest shoes hitting shelves in the new year.

As running brands invest in social media influencers and professional athletes, runners face new opportunities and challenges

A 125-mile traverse of the southern Japanese Alps, from Kyoto to Tokyo, onsen to onsen

Our new weekly discussion program covers outdoor recreation and adventure

How Montana’s Mica Kantor used his passion for running to demand meaningful change

From racing the world’s most competitive ultras to advocating for policy change, this adaptive trail athlete is demanding change for the sport

The Running Event is America’s largest showcase of future running gear trends. For the first time, it will be livestreaming for the public.

This summer Courtney Dauwalter made history, becoming the first athlete to win the three biggest races in ultrarunning in the same year: the Hardrock 100, the Ultra-Trail du Mont Blanc, and the Western States Endurance Run. What’s her secret?

Science shows that strategies for improving your running economy aren't the same for trail and road running. Here's why.

A new review study points toward post-exercise ketone supplementation as a way to improve adaptation and performance. What does the uncertain science mean for endurance athletes?

Spending money doesn’t count when it’s for running - don’t miss these special holiday deals. 

Here are nine of the best off-road running shoes we’ve run in since late summer

Just 16 months after his first leap, Jonathan Cox completed 102 jumps in 24 hours

How the Dauwalter duo completed a dream of crossing a finish line together

Coach Stefanie Flippin dives into the evidence behind cross-training, and when it can be helpful, and when you should just run.

Criminal-turned-athlete John McAvoy is harnessing the transformative power of sport to put young people on a better path

An inspiring lineup of one-of-a-kind runners you’ll wish you heard of sooner

After 60 years, the JFK 50 Mile Race is sticking to its community-centered approach, and people keep showing up

What to get the trail runner who has everything? Here are our editors’ picks for the best gifts for picky gear heads.

American Charlie Lawrence just set the 50-mile world record, and he made it look easy

The annual challenge has become a competitive—and borderline obsessive—endeavor for runners and hikers

The evidence behind adding plyometrics to your strength routine, and tips from experts on getting started.

The Merrell trail running athlete shares her experience of discovering a BRCA1 gene mutation—and pursuing her dreams anyway

These ready-to-gift products from Hydro Flask make holiday presents as simple as putting a bow on it

Nine independent ultrarunning races have organized to form the World Trail Majors in 2024.

We looked at thousands of data points from Strava to see which American marathon is more difficult

Chipping away at your running goals with multi-year consistency is the best way to achieve them

Here’s a look at the gear, tech, and media our Outside Run editors were obsessed with last month

This light and fast trail cruiser is cushy, agile, and energetic

Without an official definition, this alternative term might be more useful

After developing an early passion for trails, this elite trail runner from Northern California continues to ground her practice in trust, fun, and...race walking

Focusing on your arm swing is a quick and effective way to improve your stride

Harvey Lewis, who recently ran 450 miles to win Big’s Backyard Ultra, discusses the mental trickery that goes on during ultrarunning’s hardest race

To ward off cognitive decline, a new analysis suggests that strength matters more than how much muscle you have

Inside the spectacle of ultrarunning’s most festive top-tier 100-mile race

Those who pursue the craziest endurance races on the planet do it for reasons that make perfect sense

This 250-mile loop around the national park connects tons of trails and a few roads to explore the outer edges of the Smoky Mountains.

Optimizing your biomechanics, even on unstable terrain, is key for running faster and reducing injury risk. Here's what the science says about trail running biomechanics.

Harvey Lewis runs 450 miles in five days while six runners ran at least 100 ‘yards,’ more than 416 miles, at this year’s Big Dog’s Backyard Ultra

Sally McRae tapped into “the power of the mind” to finish the “Grand Slam of 200s”, culminating with a win at the Moab 240.

The new science of skill acquisition can help coaches and athletes get more out of their workouts

The relationship between mental health and running is complicated. Understanding it can be a game changer.

From professional track star to strong finishes at trail running’s most competitive races, it’s her passion and faith that propels her onward

A regional Canadian race director cries foul after a new UTMB World Series event is launched in Whistler, sending North American trail running community into frenzy.

When you're plodding so slowly it feels like you're moving backwards, wouldn't it be better to just...walk?

The UTMB World Series announced a new policy regarding adaptive athletes with the hopes of increasing participation. Many adaptive athletes say it doesn’t recognize the realities they face to create a path toward equity. 

Newsflash: All that data you’re mining may not be good for your health

A look at how training has changed from the early days of the sport to the record-setting landscape of today

Labral tears are an increasingly common running injury. Three elite athletes with firsthand experience weigh in on all the essentials for recovery.  

The founder of Runners for Public Lands listens to the land to guide him toward a deeper sense of belonging, responsibility, and play

Kristian Morgan set a new southbound FKT on the Appalachian Trail, but he’s not done yet

Lucy Bartholomew just became the second woman to race UTMB and the Ironman World Championship in the same year. Here's what she learned.

In addition to loaded 100K and 100-mile races, there’s also a 31K night race, costume contests, and a Halloween rave.

Discover gains with the BOA PerformFit Wrap, proven in scientific trail tests to boost speed and stability over traditional laces

While technology like heart rate monitors may feel cutting edge, many experts and coaches recommend running by Rate of Perceived Exertion. Here's why, and how you can implement RPE in your own training.

More athletes are turning to the ancient tradition for relief from pain. But does it actually work?

This episode explores Peterman’s journey in learning from his latest injury and slowing down to enjoy family, friends, and life.

Exercise is the closest thing we’ve got to a miracle cure, but that doesn’t mean you’re immune from things like heart disease and diabetes–no matter how young and fit you are.