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

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.

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.

Your microbiome absolutely impacts your health, but taking postbiotic supplements won’t do anything to help

A 14-woman crew sets out on a mission to test microplastics levels in remote regions of the world’s oceans

A bad sleeper tries to train her brain with the help of virtual jellyfish, space-flight simulations, and the URGOnight device

Researchers are searching for telltale clues in your strength, flexibility, or body position that signal an impending injury. It’s harder than you think.

For centuries, dowsers have claimed the ability to find groundwater, precious metals, and other quarry using divining rods and an uncanny intuition. Is it the real deal or woo-woo? Dan Schwartz suspends disbelief to see for himself.

The 46th president made big promises to move the United States toward a carbon-free future. What he’s accomplished so far has been impressive, but can he keep up the momentum?

A new analysis digs into who overheats and which conditions are most risky, with surprising results

Setting high goals is great, but how you deal with falling short determines how long you’re willing to keep chasing them

What separates the best endurance athletes from everyone else isn’t their amazing lab test data or power values—it’s how well they maintain those values after a few hours of exhausting exercise

Edgar McGregor started cleaning up Eaton Canyon near Los Angeles in May 2019, and he didn’t stop until it was spotless nearly two years later. We talked to McGregor about how to stay motivated to take care of the earth.

With the stroke of a pen, the secretary of the interior just undid most of Trump’s harmful energy policies

It’s easy—maybe a bit too easy—to believe that poor sleep leaves you more vulnerable to injury. But researchers aren’t so sure after all.

Two new books, ‘Under the Sky We Make’ and ‘Overheated,’ lay out a plan to overcome our cynicism and anxiety and realize a sustainable, carbon-free future

In his new book, ‘The Nation of Plants,’ botanist Stefano Mancuso suggests that human democracies may have something to learn from the world’s trees and flowers

The newly revamped TrainerRoad cycling app uses an advanced algorithm to create training programs custom-tailored to the user. Our writer gave it a go.

Maintaining the ability to hit top gear after your twenties is useful even for endurance athletes, and takes specific training

Challenge what you think you know about diets, nutrition, and why we eat the way we do

In his new book ‘A Most Remarkable Creature,’ indie musician and writer Jonathan Meiburg travels to the bottom of the planet to investigate a very strange bird of prey that puzzled Darwin himself

Running alone against the clock is very different from trying to beat other runners, but untangling how our minds process the challenge is “like knitting with spaghetti”

A new review assesses what it takes to maintain endurance and strength when circumstances interfere with your usual training

Changing hormone levels affect your tendons, ligaments, and muscles, and evidence is mounting that this can influence your chances of injury

Round out your training routine with exercises to help build explosive strength

Mental fatigue has become a hot topic for sports science researchers, but its effects remain controversial

A new book by the acclaimed science journalist Michelle Nijhuis looks at human attempts to save other species from extinction, from John Muir to the World Wildlife Fund

In an excerpt from ‘In Search of Mycotopia,’ a new book about different communities exploring the multiple uses of fungi and mushrooms, the author goes foraging with William Padilla-Brown, a rising star in the mycological movement

Vaccines are rolling out with increasing speed, but we’ll also need effective treatments, because new coronavirus cases will be a worldwide reality for years to come. Enter Jacob Glanville, a maverick San Francisco immunologist who believes he’s found an unparalleled path to healing.

Detailed power data from sprinter Marcel Kittel and climber Tom Dumoulin highlight the contrasting physiological demands faced by different riders

A new study explores how inner monologue varies between sports, situations, and experience levels

The billionaire philanthropist has thrown his wealth at some of the world’s most intractable problems, drawing both praise and criticism along the way. His approach to tackling the climate crisis is no different.