Science

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After an exhaustive search of the literature, researchers conclude that, well, it's complicated

In 'The Next Great Migration,' journalist Sonia Shah explores the hidden history of human and animal movement

The continent has entered its long, dark night, but just over the horizon is the question of how to make sure it stays free of COVID-19 once it reopens in August

When the going gets tough, which sensation actually slows you down?

From pizza to ultramarathons, what's the best way to chill out?

Beat back summer-vacation boredom with these seven games for the family

The ability to sustain a high rate of energy burn for a prolonged period of time may help ward off cancer

The pandemic is prompting activity-tracking companies to pivot from personal to public health

New research says yes. Fortunately, there's something we can do about it.

These items will keep you comfortable and protected while you tend to your flowers and veggies

The hotter it is, the closer we come to the ever elusive goal of besting the horse—which supports the evolutionary "born to run" hypothesis

Three new studies explore iron patches, injections, and dose frequency

Sweaty workouts do enhance your endurance, according to a new theory, but it may take longer and function differently than previously thought

A new aerodynamic analysis runs the numbers on exactly where to run when you’re behind someone else

Between a global pandemic, protests against police brutality, and unprecedented environmental rollbacks, a lifelong asthmatic reflects on how 2020 is the year we must come to terms with the tenuous nature of this simple act—and why ensuring our fragile future begins with protecting our air

Understanding the interface between humankind and wildlife is essential to averting infectious-disease outbreaks. We can't afford to ignore it anymore.

Trying to improve your sleep quality? Get back to nature.

A new study uses the training data you upload to sites like Strava to estimate the "critical speed" that determines your race performance

Spanish-speaking guides call the drug "levanta muertos" for the way it "brings life to a dead person"

To figure out how your body will respond in hot conditions, consider your “physiological equivalent temperature”

When excruciating ankle pain threatened to sideline her ski season, one of our hard-charging editors tried Lazarus Naturals' CBD balm as a last resort. It worked—even though she still doesn't know how.

From a young age, the ocean provided relief from mental illness, something I've been unable to replicate with any other form of nature. It turns out, there's a science behind why some people prefer water.

Emily B. Martin's new novel, 'Sunshield,' is inspired by American landscapes and explores how individuals can impact their environment

Maybe the debilitating effects of chronic overtraining syndrome are in your muscles after all, not your head or your hormones

A group of eight researchers from China just summited the mountain with the sole mission of getting the most accurate measurement to date of the world's tallest peak

Doctors take an oath to do no harm. But in her book, 'Sex Matters,' emergency medicine physician Alyson McGregor explains how doctors are unintentionally harming women by practicing a model of medicine based on men.

Physiologists from around the world share their pet theories and crazy ideas on what it will take to break records

A new study of female athletes sees big strength gains from twice-a-week lifting

Researchers put the four main running power devices through a series of tests and picked a clear winner

They're not more tired than the rest of us, according to a new study—they're just better at sleeping

Yes, it tastes great, but it's not a drug

New research explores why you go slower and feel worse, even though you’re pushing as hard as usual

In his new book, 'The Wedge,' bestselling author Scott Carney travels the world to investigate the surprisingly effective methods humans have developed to rewire our brains and control our response to stress. And it all starts with taming fear.

Wouldn't it be great if there was a technique that would allow us to vanquish fear and beat back stress? 

New research on mental fatigue suggests that even elite runners perform worse after a 45-minute computer task

Last week a paper suggested that runners and cyclists need much more than six feet. The report went viral, and backlash ensued. But there was some legitimate science behind the claims.

New research suggests that the lactate produced by hard interval workouts alters the hormones that determine your appetite

But you still need to avoid others as best as you can

So-called "flush drownings" lack an obvious cause like getting trapped underwater. Researchers now believe water temperature is a key factor.

There's something about swimming that makes us feel very much alive—even as we enter an environment where the risk of death is all around us

Increasing my visibility profile on the bike seems like a great way to improve safety. But does it matter?

Some sports scientists believe that a measure called the "acute-to-chronic workload ratio" can predict your risk of injury. But critics aren't so sure.

Even with major races postponed, the sport remains upside down, with the focus still on shoes instead of who's wearing them

For endurance athletes, new research suggests that different pre-race rituals, or even no warm-up at all, give pretty much the same results

Products and companies offering a quick and easy immunity boost aren't going to help, but these three everyday practices might

Social distancing is a prime opportunity to discover the nature in our own backyards and redefine our idea of what's wild

Journalist Sarah Scoles's 'They Are Already Here' explores people's obsession with discovering what else may be out there

What to buy, what to cook, and what not to worry about in the age of COVID-19

Our writer tests out a novel “natural performance enhancer”: breathing through your nose. It's harder than it sounds.

Nobody gets a free pass to sit all day, but new research on how sitting affects your arteries offers some encouraging news for cyclists

Emerging research suggests that you should embrace the steam

Nutritionist and journalist Christy Harrison makes a case against the state of nutrition in America in her new book, 'Anti-Diet'

New lab data from a record-setting 59-year-old offers insights on how we age—and, potentially, how to avoid it

Yes, it's serious, and it's time to start taking some practical precautions

Outside's go-to physician, Dr. Brian Cole, weighs in on anxiety, headaches, and poor posture, in his Ask a Doctor column

Recent studies suggest that sunlight may lower blood pressure in ways that have nothing to do with vitamin D

As the temperatures warm, heavier snow is likely to become the new normal

Humans were born to dive, according to some scientists, and that fact helps us thrive at high altitudes

After a nasty bike accident, journalist Sarah Allely found basic activities impossible. Then she started spending more time outdoors.

A wilderness medicine expert and former AT thru-hiker shares her tips for tackling a long-distance backpacking trip

With over 8,000 different "sustainable" hotel certifications, how do you know what's greenwashing and what's the real deal? We consulted experts to find out. 

Pretty much every elite endurance athlete trains in mountain air or the altitude-tent equivalent. But a few scientists think they're wasting their time and money.

Computers can identify sounds much better and faster than humans. So what do we learn when we ask them to listen to everything?

Before trying a fad diet, make sure you have all the information—and eat plenty of calories while you're at it

The United States leads the world in spending for health and fitness but still ranks lowest in measurements of actual health. How do we break the cycle?

After a long day on the slopes, your body deserves a little après of its own

Or why you don't have to get up at 4 A.M. to perform a two-hour ritual of self-care

There's at least a theoretical basis for believing in the power of CBD topicals

Launched by Specialized CEO Mike Sinyard, Project New Day promotes the use of hallucinogens like mushrooms to treat addiction and PTSD

The simple story of an unfair shoe with “springs” doesn’t capture the true complexity of the ongoing debate about technology in footwear

A new study finds unexpected benefits from super-short intervals with even shorter recoveries

Journaling is for everyone, but especially athletes. Here are the two types of journals you should have and how to get started.

Scientists are increasingly skeptical of the benefits of flexibility, but the fitness world doesn’t want to hear it

When Rebecca Mehra tried to unplug a broken oven, she almost ended her track season—or worse

Fluorinated glide wax is being banned from elite competitions, and big brands like Swix say they’re searching for environmentally friendly alternatives. But the seductively speedy—and noxious—compounds are unlikely to loosen their grip on the sport anytime soon.

New research hands down verdicts on what to lift, how much, and how hard

Six testers ran, climbed, hiked, and played outside with 17 different deodorants. Here's what didn't stink.

Personalized drinks and shakes are the latest innovation in the quest to boost performance