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How to get to the root of GI problems while running and racing.

This weekend’s races are part of North America’s first UTMB World Series Major

A stacked field and totally different courses are sure to shake things up at the 2023 event in Auburn, California. Here’s what to know, and how to follow along.

Real-time video coverage of ultrarunning events is becoming increasingly sophisticated. Is that a good thing? 

Enter now for a chance to win a year of hydration from SOS Hydration

Dimity McDowell had built her life around running. But to stay pain-free, she had to accept that it was time to put the running shoes away—for good.

UTMB is updating its entry system for runners who give birth. Here’s what you need to know.

Training, tools, and techniques vary. What you need to know to choose a physical therapist versus a chiropractor.

We all should take a lesson from the “gamifying the run” approach.

Understanding your heart rate can be helpful to calibrate your perceived exertion, especially on easy and steady runs. This simple method is imperfect, but can be very useful for a general understanding of training intensities.

Check out Zoë Rom's author page.

With pasta, there are endless pastabilities for carb loading.

This update to Hoka’s beloved carbon trail shoe mainly stays the course, but offers a few welcome upgrades—a sharpened upper, lighter weight, and increased durability

A look at the history of this essential piece of equipment. It’s come so far, thanks to enterprising runners, but is still not adequate for a high percentage of women.

How Zachary Friedley is building an event by adaptive athletes for adaptive athletes

Age may be just a number—but so is your weekly mileage.

Jim Walmsley is headed to the start line of the Istria 100 in Croatia. Here's who else is competing, and what you should know about this event.

Here’s how the champion trail runner is preparing to take on the legendarily ‘hilly’ Boston Marathon Course in her 26.2 debut.

How to use this stretchy, therapeutic tape to effectively reduce pain and support muscles, tendons, and ligaments (almost) anywhere on your body.

We’re teaming up with the world’s biggest race organization to give you a front-row seat to the biggest names and races in trail running. Here’s what you need to know.

How to best care for your body to keep doing the outdoor activities you love

For years, this elite runner, coach, and surgeon specializing in lower extremity injuries treated hundreds of runners. Until it was her turn to be sidelined.

Strong stomachs win ultras, says Gediminas Grinius, Lithuania’s highest performing ultrarunner, thanks to loads of training, carbs, and fermented foods

In his new book, ‘A Mile at a Time,’ endurance athlete Travis Macy offers key insights about helping his dad endure Alzheimer’s disease. 

With over 60 on-the-ground events and virtual watch parties, one of the sport’s most vibrant film festivals is hitting the road to offer new screenings in the U.S. and internationally

Don't let your own ambitions put you in danger: Knowing when to take a risk and when to run away is an essential skill for every adventurer.

What do runners need to know about this condition? 

To break both the men’s and women’s solo records for The Speed Project, a race from Santa Monica to Las Vegas, you need a crew as nuts as you are

"But what if smartwatches are getting too smart? How much do we want them to know? How much do we want them to tell us? What if we don’t do what they say?"

Wool, fleece, Polar-grid, and waffle knit: here’s the science behind certain fabrics that keep you warm and comfortable in a variety of conditions.

Expert strength running coach Jason Fitzgerald wants us to keep our easy runs easy, but not forget the importance of workouts 

Simple steps to rebooting your fitness and reinvigorating your running goals

Lake Sonoma is celebrating its Sweet 16 with Team USA Selection and a deep field of competition. Here’s what to know about this legendary 50.

Are you there spring? It’s me, running. Here’s all the gear our editors loved last month.

April Fool's Post: After a historic snow year, the world’s premier 100-mile footrace will now be a skimo event.

April Fool's post: 400-mile races are the new 200-milers, and if you’re not running 400 miles at a time, you’re not really a runner.

April 28-29 races will start and finish in Auburn with adjusted courses and time cutoffs.

Small upgrades have vastly improved this road-to-trail cruiser

Our hiking columnist has spent more than a quarter of the past four years on trail. Every morning out there, without fail, he eats another perfect packet of Pop-Tarts.

A near-death experience prompted this trail runner to take stock of what mattered to him: fighting for civil rights and adventures in the mountains.

Our nutrition expert takes us on a tour of fueling options available at most running specialty stores, and how runners can shop smarter to fuel their races and long runs.

Athletes of all levels have considered whether their choice of birth control might influence how they train, recover, and perform. But the answer is complicated. Here’s what you need to know.

A perfectly designed training program might aim to have ideal intensity distributions. But what happens to a perfect program when you add hills? The answer to that question can lead to fitness breakthroughs... or collapses.

Do your favorite running routes mix road and trail? The Nike Pegasus Trail 4 GORE-TEX INVISIBLE FIT is the secret sauce for excelling everywhere.

NCAA track champion and Mount Marathon winner Allie Ostrander continues to be open about the long road of eating disorder recovery. Could her transparency change the sport?

I grew up hiking in the White Mountains. But I never fully appreciated them until I moved away.

The American ultrarunner set a new women’s world record on Saturday after logging 435.336K (or 270.505 miles) in 48 hours at Sri Chinmoy 48-Hour Festival in Canberra, Australia.

Stuck in an adventure rut? Here’s the best advice our editorial team has on living adventurously.

Run the world’s largest night race and you’re bound to have one of the most unusual experiences of your life

These little powerhouses not only help fuel our training, but they define the exact ways our bodies respond to the training we do. New data says mitochondrial check ups could even help with the future of training and life in general.

What started as a Facebook page for group runs and became dinners, workshops, and a community on the East Coast.

We asked experts how much protein, and what kind runners should be eating.

Double threshold days and lactate meters have propelled Jakob Ingebrigtsen and others to the top. Should the rest of us follow suit?

Women Take The Lead Retreat is creating space for women of color in the running industry to network, learn, and connect with tools to advance their careers

Discover stories from Backpacker, Outside Online, Clean Eating, Climbing, and other brands across the Outside Network

Growing up as an immigrant had her believing that she had to be stronger than everybody else just to get by. When she started trail running, she was physically tested in ways she found thrilling.

It's one thing to think about a workout; it's another to actually do it. Here's how to make sure workout brain doesn't convince you to quit.

The Trail Team, a newly formed startup, aims to develop sub-ultra trail runners.

We review six of the hottest smartwatches from the last year by price, specs, and an eight-point rating system.

A former elite runner finds her creative stride by designing activewear that tells the story of her family history in the French West Indies

The boutique Portland brand debuts its best shoe yet, a versatile ultra crusher that’s modular design can be customized to you.

Three runners finish what is typically a nearly impossible race in Tennessee

Your arms are dropping lower on long runs, or your shoulders are tight and sore afterwards. Sound familiar? This is a problem that can be fixed with this weight training circuit for runners.

A recent study explored how runners can use these mental strategies to perform better, and enjoy their time on the trail more.

The craziest event in trail running began Tuesday morning in Tennessee's Frozen Head State Park

A new study reviewed the short-term and long-term performance impacts associated with low energy availability, along with the nuances of how low energy availability relates to body composition. The science is unequivocal: athletes need to eat enough, always. What that means can vary based on the athlete, the season, and their goals.

The real magic of much-hyped ketone supplements, according to Belgian scientists, is how they enhance recovery

How Jimmy Elam wins big ultra races without sponsors, while holding onto his love of running for running’s sake

Here’s how rabbit’s co-founder balances family, training, and running an apparel company

Has Maurten finally figured out how to harness the power of baking soda without paying the gastrointestinal price?

The fitness industry is rife with harmful messaging around food and exercise. Here’s what to know about when food behaviors are a problem.

How social media and marketing turned empowerment into a hashtag that substitutes awareness for meaningful action, consumption as activism.

One writer’s advice after two decades of trail running: Run regularly. Not too fast. Mostly trails.

This purpose-made apparel line delivers unmatched freedom of movement and functionality to trail runners

With the arrival of a long-rumored drink, endurance athletes want to know

Every step I ran used to be in pursuit of race results. Letting go wasn’t easy, but I’m so much happier.

Olympian and veteran elite coach Mark Coogan’s central advice on making the most of your miles

The champion ultrarunner gives us advice for ditching the data and reconnecting with what we love about trail running.