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

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

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.

For starters, there's hesitancy about the confluence of drug testing and unregulated products

There are more ways to mess up the common move than you think. This guide will help you progress into a flawless lunge.

Patricia Baker established multiple track-cycling records in her age group after taking a 20-year break from racing

This exercise routine from legend Robert Killian focuses on functional strength and mobility, you can do it almost anywhere, and little to no equipment is required

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

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

Iain Mickle's secret to tackling sub-three-hour marathons late into his fifties? Running buddies.

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

The controversial author and personal trainer shares his lessons from the outer limits of self-experimentation

Follow this yoga routine, in addition to your time on the slope, to improve and maintain your strength and flexibility all season long

Expert advice to help you recover fast, stay injury-free, and have fun in the mountains

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

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

Heat training has been hyped as a powerful workout enhancer, but new research sounds a note of caution

With multiple intensity zones and a unique three-sided design, the new TRX Rocker recovery tool takes foam rolling to the next level

Anyone who disagrees is an "obvious idiot"

Klaus Obermeyer shares some tips on work, exercise, and (of course) skiing

Researchers deploy machine learning to match running styles to the risk of different types of injury

A holistic guide to strong, healthy shoulders

To better push your limits, try swearing off some of your most familiar crutches now and then

Improving your max aerobic power may come at the cost of worse efficiency, a study finds

17 of the year's best pieces from our Do It Better columnist Brad Stulberg

Improve your range of motion, increase efficiency, and boost flexibility and balance with these five mobility moves

To train athletes to truly push their limits, it helps to draw inspiration from the French social theorist Michel Foucault. Seriously.

The military is rethinking physical training and overhauling its classic fitness test. Think you have what it takes?

One of the best boulderers of the 1990s is climbing into her fifties

Make yourself more injury-proof by using these poses to increase your strength and flexibility

The cross-country skiing icon was beginning a new chapter in life when a diagnosis changed everything

Two new books take opposing views on one of the most contentious issues in sports

Great titles for the endurance-curious, or to curl up with yourself

Cross-training is key for improving performance, recovery, and resilience, whether you're running on the road or on the trail

There's no silver bullet, but these useful practices will help you keep training

Whether you're bringing Fido up a volcano or on an impossibly long trail, these tips from runner Alex Borsuk will help you and your pooch stay safe and happy

After a long day on the slopes, these seven moves (which can be done at the après bar) will help you recover and stay injury-free

Platelet-rich plasma therapy, or PRP, has been touted as a miracle cure for sports injuries, but it may counteract the benefits of plain old rehab exercises

These new training apps can craft customized routines based on your past performance. It’s almost like having an automated personal trainer. 

A new analysis tracks people doing 35 hours of exercise per week for a decade, and finds no evidence of heart risks

Outdoor athletes suck at squatting. Here's how to fix your form.

7 kettlebell exercises to up your strength and conditioning

Knee pain plagues athletes of all stripes. Here are some of the best exercises to help mitigate and prevent chronic occurrences of it.

Swenson just summited one of the last unclimbed peaks in the world

Scientists can forecast marathon performance fairly accurately. But for longer distances, things get complicated.

'Standing Man' chronicles cyclist Payson McElveen's attempt to set a new fastest known time on a loop of White Rim in Utah's Canyonlands.

And new research shows it may be one reason why women tear their ACLs more often than men

All-out sprint speed may seem irrelevant in longer events, but new science is making the case for having a “speed reserve”

At a conference on sports innovation, sleep scientist Charles Samuels cuts through the hype

The world's most successful freeskier and Warren Miller film star says big-mountain fitness starts at home

Keep the cold at bay with these 9 moves that you can do anytime, anywhere

10 exercises to make you strong, fast, and explosive on the hill

Here's what he learned from it

None would be where they are today without the influence of these people

The fastest woman on skis isn't slowing down

Put in the work now to have a successful winter

Get started. Keep going. Stop.

Get your feet reacquainted with natural movement and your body will thank you

The Swedish company Maurten's hydrogel drink has taken the endurance world by storm over the last two years. Now scientists are testing their claims.

Over the past decade, athletes, coaches, and researchers have been seduced by the performance-boosting promises of brain stimulation. On a ride-and-zap-your-brain-like-the-pros tour through the Alps, Alex Hutchinson wonders whether it really works—and whether we want it to.

Yoga inversions are easier—and more useful—than you might think

The 45-year-old likes to undergo days-long adventures that combine mountain biking, rafting, and climbing

The two-hour barrier and the women’s marathon world record both fell this weekend. The history makers, Eliud Kipchoge and Brigid Kosgei, have one obvious thing in common.

A new study quantifies the time gained and lost from the geography of the INEOS 1:59 Challenge course, and suggests that you don’t need to sweat the curves

Blood glucose monitoring for performance is becoming more common. Here's what you need to know.

Crunching the data suggests that distance runners at this year’s track world champs paced more aggressively than ever

Delayed gratification gets harder when you’re overtrained, according to a new brain-scanning study

A handful of new products are claiming they can. The jury's still out on whether they deliver enough of an edge to justify the agony.

New evidence bolsters the claim that adapting to hot weather gives an all-around fitness advantage—but not right away.

Whether you’re striving for peak performance or coming back from injury, psychological techniques can help

Some key takeaways on hydration, power meters, recovery, and menstrual period tracking

NOLS (National Outdoor Leadership School) is founded on a simple principle: If you take students into the wilderness, they come back better people

This basic, effective workout will build functional strength in key arm muscles

Ten moves to improve strength, running economy, and resilience for the road or trail

The former downhill champ has had his fair share of spills—and he likes to show them off

The quality of your habits determines the quality of your life. Here's your step-by-step guide.