How can runners measure their progress? Here’s how to be sure you’re asking the right questions and using the right timeline when it comes to measuring adaptations.

The former hockey player turned triathlete turned ultra runner is heading to Chamonix to Race UTMB OCC

Despite record snowpack and extreme heat, the ultrarunning dentist shaved over five days off the previous record

The history and science of modern endurance fueling.

The American mountain runner returns to international racing with stoke and strategy to spare.

How will Tom Evans tackle the notoriously difficult Western States UTMB double? By taking the pressure off.

Brooks adds Stanford’s Meika Beaudoin-Rousseau to its growing trail running team

About to make his UTMB debut, Colt says the less he frets, the better he seems to perform

This one tool can help you set big goals, move past setbacks, and defeat your inner critic

Three trail athletes share their best cross-training tips on when, why, and how to incorporate other sports into your routine

After an already packed year of racing and adventures, the French runner can’t wait for more

JP Giblin improved on his runner-up showing in 2022, while Jacquie Mannhard, a mother of two, won by nearly two hours

Trail Runner’s editor in chief, whose new book co-authored with Tina Muir, ‘Becoming a Sustainable Runner,’ is now available, believes there are many approachable steps runners can take to improve their running and the planet

A national record holder for Greece in the 10K, Pappas continues to explore her limits with a late entry into the high altitude 100 miler

A Q&A with the ultra running star on her preparation for UTMB, the changes she’s made in training, and the best piece of fitness advice she’s ever gotten

Native Women Running’s team is running the three-day TransRockies Run for ancestors, family, courage, and inspiration

More than 700 runners will toe the line for the 40th running of the Leadville 100 trail race

Everything you need to know about the UTMB race series in Chamonix.

Although she’s only been racing on trails since 2021, Laukli has quickly become one of the world’s best mountain runners

Going fast on downhill trails takes some courage, and a fine-tuned set of mental skills. Here’s how to use your mind to run faster downhill on trails.

How late-blooming ultrarunner Becky Bates excels at mountain races in her 60s

As the sport of running grows, so do many of its cottage industries. Coaching has quickly become an industry that many are tapping into as more people enter the sport, but experiences may vary.

Here’s how pro runners and medical experts weigh in on this debate

Will Peterson overcame downpours, flooding, and his own hectic schedule to smash the unsupported FKT on America’s oldest thru-hike

The Running Industry Diversity Coaltion’s study emphasizes the long road ahead for achieving racial equity in trail and ultrarunning

For races that require multiple overnights, here are some science-backed sleep strategies to help runners maximize performance on multi-day events

Erin Ton dashed to the summit of 57 of the Colorado’s 14,000 peaks in a little more than two weeks, but skipping Culebra Peak has caused a firestorm of backlash

In January, Runners for Public Lands launched a new program to help runners from underrepresented backgrounds thrive in the trail community. Here are the first athletes.

Researchers present new findings on mental fatigue, mental training, and the importance of your surroundings

Focusing on being positive, calm and purposeful can help you reach the summit of small hills and big mountains

Enhanced with a carbon-fiber plate, responsive foam, and Vibram rubber, the Ultrafly is Nike’s first high-performance trail racing shoe

What started as a team self-supported effort with Liz Derstine, ended as a supported FKT

The 26-year-old died after a long fall while soloing Blitzen Ridge (5.4) in Rocky Mountain National Park.

The questionnaire screened for Female and Male Athlete Triad risk factors, while also asking athletes about their mental health.

OK, there are no secrets, but she combines hard work with a fun vibe and doing whatever works for her.

They don’t necessarily save energy, but a new study suggests they might save your legs

On the second day of his first ultramarathon, the runner withdrew just a few miles from the finish line. But that didn’t stop him from completing the race.

How to manage this ongoing challenge for trail and ultrarunners

Embracing science-based training ideologies is the best way to develop aerobic fitness and improve performance in endurance sports.

I tested 35 eco-friendly pieces over 600 miles. Here are 11 tops and bottoms that performed as well or better than non-recycled apparel.

To optimize your health or supercharge your training, you sometimes need to look beyond the lab

Interesting mid-run offshoots and alternatives can mix up the monotony of serious training

This viral social media movement focuses on consistency over intensity, and it might help you recommit to a running routine

Mountain running involves more risks than a jaunt around your neighborhood trails. Here’s how to navigate and mitigate risks so that you can make informed decisions in consequential terrain.

We tried three at-home sweat tests so you don’t have to. Here’s what sweat tests are best, and how to use that information for a trail racing breakthrough.

Ankle injuries are common in trail running, here’s how to prevent them

From humble beginnings to advanced fabrics and plates, what a strange trip it’s been.

A trail running therapist shares her tips for using mindfulness to race and train better

Whether she’s setting mountain FKTs or working to bring attention to climate change, Hillary Gerardi is a force of nature

Tips on how to train and race in muggy and hot conditions

The historic ultramarathon in Vermont was canceled due to historic floods and a state of emergency. This didn’t stop race organizers and runners from helping out those in need.

Follow Black Diamond athlete, Kyle Richardson, in Rio de Janeiro while he explores styles of Brazilian drumming and trail running

These off-road-ready supershoes provide pop while adapting to tippy terrain

Feeling out of shape? Maybe you should run up and down a mountain three times.

Focus on your own training and performance as you immerse in the local community and the unique challenges of the natural environment

Common causes and solutions for when it’s hard to eat during a race.

Four experienced runners and coaches share their biggest mistakes and lessons learned in trail and ultrarunning

David Hedges sets new FKT (Fastest Known Time) on the Nolan's 14 route in Colorado.

Jean-Luc Diard, cofounder of Hoka, has been innovating in the outdoor world for decades and he’s not done yet

Ultrarunning helped this athlete prepare for the rigors of a space mission.

Aurelien Dunand Pallaz led the men's field from early on for a win while Dauwalter battled from second place to surge for the win and course record.

After a very snowy winter, race officials and volunteers put in huge efforts to make sure the course was safe enough to be run this year

There are both healthy and harmful ways to get away from it all, psychologists point out

I’ve tried dozens of hot-weather tops, shorts, glasses, and hats over the years. Here are my favorites.

There’s nothing difficult about this nutrient-dense green recipe to keep the immune system strong and recovery speedy

Trendy recovery gimmicks are advertised everywhere, but professional trail runners know it’s all about prioritizing the basics.

The quest for a sub-four day Long Trail continues, but Kelly sets the supported FKT in some of the rainiest conditions imaginable

Age slows everyone down eventually, but that’s no reason to quit trail running.

A small subset of Hardrock Hundred runners stretch to complete a superhuman series.

Tips on how you can guard against the most common overuse injuries.

Here’s everything you need to know about the 2023 Hardrock 100.

For the past 100 years, real-world and lab experiments interacted across continents to create our current understanding of training theory. We can learn a lot about our future by understanding our evolutionary past.

Injury to the Achilles tendon can be long-lasting. Here's how to diagnose, treat, and prevent it.

At the end of my mother’s struggle with Alzheimer’s disease, I realized I needed to handle my sorrow the same way I approached athletic training.

It’s mountain adventure season! Here’s what experts say about staying safe up high.

Researchers look back on the lessons from 25 years of “live high, train low.”

For Indigenous cultures, running represents a spiritual connection to the natural world.

A new documentary on Tom Evans' win at Western States by adidas TERREX.

Canyons 100-mile winner Alyssa Clark is preparing to toe the line in the rugged Pyrenees.

The outdoor gear giant’s new Swiftland Multi-Trail running shoe is eco-friendly, but how does it perform?