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Scientists want to know why we don’t keep getting bigger and stronger forever

Switzerland's Rémi Bonnet finished fourth in the 16.5-mile mountain race of the GTWS final and held on to win the overall men's title, while Sophia Laukli's third-place finish earned her the overall women's title—after needing a tie-breaker to seal it.

A rural road relay offers the author a chance to return home and consider important questions, like: Who has the aux in the support van and where did they find this weird club track?

The top 30 men and women will contend for the short-course world championship—and world series—titles over four days in Italy

A young doctor compares and contrasts a 100-mile ultra with cancer treatment

Eli and Tabor Hemming are having a banner year in the short-course trail running world, but the Golden Trail World Series finals might be their ultimate test

An exciting area of research involves changes in hemoglobin and the fundamental role that can play in performance. Let’s dive into a fascinating topic that may be indispensable in training and racing.

If you run in the dark, you’ll love the ability to customize your lighting with this hassle-free, modular headlamp system

As popularity in trail running skyrockets, so too are wilderness medicine courses that focus on common trail running injuries. Here are some critical ways to stay safe on the trail as seasons change.

Will training for ultras make you slow? Do you have to choose between trails and roads? And how much mileage should you actually run?

One of Canada’s most promising ultrarunners will be digging deep again in the final miles of the challenging UTMB Thailand 100-miler, to book a spot at next year’s Western States

Aire Libre is a series of ecocultural retreats that brings runners together in lesser-known corners of the world to connect with wild space

A new federal law, the Rodchenkov Act, has the potential to dramatically clean up international sports. A case involving a Texas doping ring illustrates how the new legislation works.

A delightfully low-budget documentary about the Seven Summits (of a Montana neighborhood)

We looked at a ton of data from last year’s fall marathons to see what Boston Qualifier (BQ) runners did differently in training and racing

How genetics, illnesses, and the environment impact running

The Catalan mountain runner found a new challenge by returning to the rugged terrain near his childhood home

Researchers say the iconic peak has lost nearly seven feet of elevation since 2021

How the Soboba Trail Race is raising money to combat health issues in Indigenous communities.

A new documentary goes inside the record-breaking run with the speedy Belgian dentist

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

For World Mental Health Day, we look into emerging studies that connect mental health and high altitude. The findings might surprise you.

What Diné runner and race director Harold Bennally has created is all about community

‘Limits’ makes fun of the challenge of landing a professional contract in a way that will delight fans and non-fans alike

How to think on challenging runs depends on your intention. Here’s what the research says.

Toss out the marathon prediction equations. Understanding what determines ultra performance takes a whole different approach.

All the digital training data in the world may not tell you whether your workout was any good

The American ultrarunner credits patience and reduced carbohydrate intake during the 153-mile Spartathlon as a key reason she was able to smash the course record

These commonly neglected training strategies will increase the likelihood of your fastest marathon—and they couldn’t be easier

Phillip Kwa’han Espinoza created the San Diego 200 to reconnect with family roots and empower Native youth..

Even as trail and ultrarunning explode, the spoils of professionalization aren’t spread equally across the sport. Athletes on this year’s U.S. 24-hour team are looking to change that

Merrell invited six athletes to run up a Colorado mountain. The first ones to the top got a sponsorship deal. Sounds simple, right? Not so much.

From ice baths to chocolate milk, there are a lot of recovery myths out there. Before you buy $800 compression pants, here’s what you should know about the science of recovery.

The buzzy supplements are purported to improve everything from recovery to focus and performance. But what does the evidence say?

A rigorous new study finds small changes in heart rate and subjective feelings of recovery. Do they matter?

The singer, songwriter, and guitarist for the Postal Service and Death Cab for Cutie applies the same approach to ultramarathons that he does to touring: just keep moving.

Inclement weather and surprisingly runnable terrain soften bite at inaugural Beast Coast UTMB World Series event and trifecta qualifier. The 100K served as a Hoka Golden Ticket race for Western States, and the 100 miler doubled-up as UTMB qualifier and Hardrock 100 lottery qualifier

More than 5,000 runners are expected to compete in Nice Côte d'Azur by UTMB

What the science says about building a well-structured training plan for consistent progression.

Running from hut to hut over multiple days among dramatic mountains with others offers a unique format to experience awe, sustained immersion in landscapes, and crazy fun 

The gear shop owner is the new president of the Prezzies

The Golden Trail World Series is elevating the exposure—and clout—of ‘sub-ultra’ trail racing

Why so many professional trail runners are now applying their skillset to race directing.

Melding her experience as a designer and an ultrarunner, Jurek wants to help young families thrive

From logistics and documentation to motivation, here’s everything you need to know to set your first FKT.

The Grindstone Trail Running Festival races are qualifiers for the 2024 UTMB World Series Finals, as well as the Western States 100 and Hardrock 100 lotteries

While plant-based meats may sound like a no-brainer for your health, athletes need to read the fine print

What trail running athletes can expect when they're expecting; advice from athletes and experts on trail running while pregnant and parenting.

Parenting can feel like an ultra in and of itself. Experts and athletes weigh in with advice for navigating running and raising kids.

Feeling burnt out on training and running? Here are evidence-based solutions to combat burnout.

Run derailed by cramps? Here’s what causes cramps and how you can prevent them on your next trail run.

Other highlights at the Pikes Peak Ascent included American Sophia Laukli being crowned the world’s top mountain runner

Study shows BOA’s dial-based fit system improves trail running performance

Out tester goes deep on this hotly debated topic

Santa Fe's Big Tesuque Trail Run offers a chance to run amid autumn aspen and support Wings of America’s Native youth programs 

The fastest known time for the highly technical line was reset twice in a six-day period.

Deceptive eco-marketing techniques prey on consumers who want to make responsible purchases. Here's how to sort through the greenwashing.

Coach Cory Leslie fosters a new team of distance runners at the Under Armour headquarters

Under Armour Coach Lara Rogers shows how women can excel in the pro ranks

In 2021, Max LeNail drowned while trail running in a San Diego park. His parents demanded a bridge. Two years later, they’re still fighting. 

Running poles have the potential to take your running to the next level—but only if you learn their secrets

Swiss runner Rémi Bonnet leads a world-class field in this weekend’s Pikes Peak Ascent

Running brands are exploring just how targeted they can get with their gear—and it’s more than just a marketing ploy

Can the famous “base building” concept apply to your strength routine, too?

A rare autoimmune disease that causes painful tumors on his body won’t stop him from chasing his passion and attempting the 100-mile Run Rabbit Run

Outside’s ethics columnist weighs in

Craft’s first true trail running shoe was built for the mountains and chews up technical terrain

Do I like planks any more than I did at the start of this challenge? Ehhh...

Analyzing glucose data from endurance athletes offers new(ish) insights, with the potential of more to come

How the self-described industry disruptor is teaming up with Run Alaska Trails to make space for athletes of color

In an adaptation from his new book, ‘Master of Change: How to Excel When Everything is Changing—Including You,’ Outside contributor Brad Stulberg outlines a path for longevity and persistence in sport

It can be a difficult decision to drop out of a race, so we asked experts to share some ways to make that choice more objective

July was officially the hottest month on record. We reached out to Phoenix runners to learn about how to adapt and train in sustained heat.

The qualities that drive many ultra athletes to succeed can also be their downfall if left unchecked. One study dives into the complexities of ultrarunners and exercise dependency.

Finding community while immersing in UTMB’s weeklong trail running celebration in Chamonix

Here’s a rundown of the shoes on the feet of the top runners in the 2023 UTMB World Series Final races in Chamonix.

Running fast is important, even for beginners and endurance athletes. Here’s why, plus four essential workouts to start.

The GOAT completes unprecedented hat trick of winning Western States, Hardrock, UTMB in one summer

The Arizona runner who lives in France became the first U.S. man to win the epic race, just ahead of Zach Miller