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A new way of classifying athletes aims to quantify the thresholds that distinguish recreational athletes from their trained, highly trained, and elite brethren

Our Sweat Science columnist spent two months measuring his blood sugar around the clock. Here’s what he found.

The latest “exercise in a bottle” study finds that plasma from exercising mice makes sedentary mice smarter. But don’t throw out your workout gear just yet.

Athletes like Mikaela Shiffrin have started adopting the training technique to increase endurance, muscle mass, and more

Over the past decade, research into compression sportswear has exploded. Here’s what the results reveal.

With increased coastal flooding and erosion, climate change is harshing California’s mellow vibes. Officials say it’s time to retreat from the shore altogether. Residents want to stay and fight. Paul Kvinta reports from the front lines of a pitched battle, where geologists and millionaires are squaring off, and friendly fire between surfers isn’t so friendly.

It’s time to break out the merino base layers and the heat-exchange breathing masks

When someone gets hurt in the wild, we know what to do. But what we’ve lacked for way too long are the tools to help people in severe mental distress.

The genes that make some people vulnerable to a fatal heart stoppage may be the same ones that give them an athletic edge, researchers suggest

Sports medicine physicians are rethinking the relationship between damage to your body and how it feels

As skimo prepares for its Olympic debut in 2026, sports scientists explore the sport’s demands

Actually, we can’t get everything we need from nature

The grandeur of the Great Salt Lake stopped Brigham Young in his tracks and inspired John Muir to jump in for a swim. Yet now it’s in danger of disappearing, sucked dry by agriculture, climate change, and suburban lawns. Many Utahns would just as soon pave it, but as Bill Gifford learned during a yearlong exploration, there’s beauty and natural splendor here that deserves to live on.

Activities such as lifting weights, hiking, or even woodworking teach us humility and keep us grounded in reality

A new study quantifies the effects of running on technical terrain

A new study uses machine learning to quantify the effects of temperature, humidity, heat, and sun

Patagonia recently updated the Willard Bascom classic ‘Waves and Beaches’

Scientists take their equations for the energy demand of hills and rough terrain out into the real world

Good news: sustainability and joy go hand in hand

The link between serious cycling and poor bone health is well established, but researchers are still debating what to do about it

The state of the steelhead in the Columbia and Snake River watersheds is dire. A Pacific Northwest steelhead angler grapples with how best to honor the people, places, and resources that she loves. 

Over the past few years, McCastle has completed 5,804 pull-ups in a single day, pulled a 5,000-pound truck across the Mojave Desert, and climbed a rope the equivalent height of Mount Everest. How on earth has this Navy SEAL dropout accomplished some of the craziest physical feats in recent memory?

The physiological differences between men and women affect how much fluid they store, how they sweat, and how quickly they heat up. Does that matter?

On an expedition to track lemurs in Madagascar, wildlife ecologist Rae Wynn-Grant found her confidence and her voice

Through the moving story of a widowed astrobiologist and his unusual son, ‘Bewilderment’ addresses our apathy in the face of environmental disaster

Yes, people sometimes die while running. No, that doesn’t mean running is “dangerous.”

Intrepid author Mary Roach shares tales of thieving bears, murderous possums, and mugging monkeys from her new book, ‘Fuzz’

Build strength and alignment to help eliminate overpronation and protect your feet and ankles

When you confront your mortality on a regular basis, the shift in perspective can be profound

A new study investigates how different types of physical performance are affected by the time of day

The case of 24-year-old Daniel Granberg, who died of high-altitude pulmonary edema earlier this month, highlights the danger of altitudes well below the Himalayan “death zone”

A new study suggests that hydrogels enable you to down more carbs with less digestive distress, and race faster as a result.

A new app called NatureQuant harnesses the latest research to track and rate your time outside. Next up: determining how much you need.

A new study measures the physical and cognitive load of four different treading techniques. The key? Generate lift.

Regular exercisers drink more, a new study confirms, but are less likely to be problem drinkers

Picking daisies with the Craighead bros

Get these six items to improve your sleep and wake up ready for anything

It’s not exactly fun in the moment, but after, you’ll say it was the best time you ever had

A long-running gym debate about whether to train each limb separately comes to the cycling world

If it seems like you’ve been hearing about lakes and beaches closing down more often, you’re right. Various types of toxic algae are multiplying like crazy in bodies of water across the country, and stopping them won’t be easy.

Endurance-science experts explain the world record holder’s incredible marathon dominance

Lyme-carrying ticks are a bigger threat than ever. A promising new antibody treatment looks to stop infection—even after a tick bite.

A new study of Western States ultrarunners illustrates the power of looking beyond simple risk factors to predict injury

Scientists have been debating whether muscles contract more slowly as you age, but new data suggests the real problem is a loss of strength

A physical therapist explains why your wrists hurt, and how to rehabilitate and protect them

After years of debate on the dangers of “too much exercise,” researchers sum up the state of current knowledge

As a college student, writer Julia Rosen spent a summer on Alaska’s Taku Glacier, which kept growing for decades in spite of warming temperatures. Now, she reckons with its uncertain fate.

In her new book, ‘The Joy of Sweat,’ Sarah Everts answers all of our writer’s questions about perspiration

Answers to the questions you’ve always had about perspiring but were afraid to ask

As events as big as the Olympic Trials get rescheduled because of heat, we went to the science to find out how you should decide when it is too hot to run safely

It turns out we have a lot in common

Exercise may not be enough to make up for thru-hikers’ bad diets, a new paper suggests

New research fine-tunes the details of heat adaptation

The buzziest supplement on the market might just live up to the hype. Here are our favorite new products.

The nonprofit Native Skywatchers has spent more than a decade collecting and preserving Indigenous star knowledge. Now organizations like NASA and the NPS are joining the movement.

A new study shows measurable gains in strength from a purely imaginary training program

Quick fixes and one-size-fits-all solutions abound in the world of wellness influencers. Here’s why you should avoid them.

We may be closer to answering lingering questions around concussions. Plus, we provide a rundown of the most common head injuries—and what you need to know about them.

The physiology of events like the Ultra-Trail du Mont-Blanc is radically different from “short” events like the marathon

The later moon missions didn’t grab as much attention as the first landing in 1969, but they had something very cool on the gear front: the lunar rover, a lightweight go-kart that gave crews unmatched mobility on another world

Instead of focusing on joint angles and limb movements, a new study takes a holistic approach to the biomechanics of elite runners

Essential questions to ask during your doctor's visit, at every age

A spiral of injuries—and the attendant existential crisis—can be an opportunity to revisit the fundamentals

Think you wouldn’t benefit from some mental maintenance? Think again.

Dealing with discomfort isn’t a magical gift. It’s a skill, and you can improve at it.

New research sifts through the evidence to figure what types of intervals make you fastest

But there’s still hope if we start managing water differently and addressing climate change, both of which are making dry spells more extreme

The mile isn’t just another race distance. It’s almost its own sport.

Exercise causes pain, but it also dulls it. Researchers are still trying to understand how that works.

To really understand the outer limits of dehydration, you need to listen to the remarkable story of Pablo Valencia

A new study tests how much cycling it takes to maximize cognitive function in endurance athletes

I study climate change, and my work left me depressed and suicidal. Then my dad got cancer.

The latest deaths raised questions about the role of COVID, but analyses of nearly a century’s worth of climbing records suggest some consistent patterns

Conservation International CEO M. Sanjayan saw our relationship to the planet in a new way after a series of remarkable adventures

A new study looks for adaptations in the placenta, and finds positive effects from exercise during pregnancy

And what happens to your brain when you finally nail it

The past year has been relentless in so many ways. But despite the challenges, there’s also a lot of good news out there to get you excited about the months ahead.

Journalist Ian Urbina is revealing the lawlessness of the open ocean in ways you’d never imagine

The evidence is everywhere that humanity is actually pretty decent, according to Dutch historian Rutger Bregman. Pay attention to it and you’ll feel much better.

Recent studies looking into a phenomenon known as post-traumatic growth show that it's possible to thrive after challenging life events. Here's how.