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When it comes to the effects of temperature on performance, perception is reality

This bodyweight workout will help prevent muscle imbalances, protect you from injury, and increase your speed and stamina

In her new book, 'Good to Go,' science writer Christie Aschwanden breaks down popular myths about recovery

Looking to boost your athletic performance? Start with your music.

On polar madness and other games the Arctic plays with the human brain

The ski mountaineer takes a no-frills approach to prepare for the world’s hardest descents

Side abs are critical to your overall core strength—don't neglect them.

A detailed analysis of historical Boston results wades into the long-running debate on sex differences in endurance

He's a retired Navy SEAL, so prepare to suffer

Trying really hard works—and then it gets in your way

A mixed workout program produces the best heart health outcomes, a new study finds

Former Navy SEAL and endurance athlete David Goggins insists that discomfort is the key to self-improvement

Five moves to get you through ski season injury-free

Keep your fitness regimen in-house

Sal Masekela, first son of a Haitian immigrant and a legendary South African jazz musician, was the face and voice of the X Games, Red Bull’s Media House, and the Olympics. Now, as the meteoric growth of the action-sports industry comes back to earth, the most connected man in the room is left wondering what’s next.

There's more to it than just trying really hard

New research confirms that a week of hot tub sessions helps your body adapt to heat

Researchers explore how your brain chemistry may start dulling pain and boosting mood before you even take a step

After adopting a meditation practice a decade into his career, Knox is near the top of his athletic game

According to the world-class climber, greatness is mostly mental, no matter your age

A frank survey of the hottest new workout classes

Here are the most jaw-dropping accomplishments of the year

Keep it simple. Consistency is key. Get out of your own way.

Real-world data shows elite ultrarunners average 180 steps per minute—and that means nothing

New research finds weightlifters have stronger tongues and runners have better tongue endurance—and that matters

After her win at the UCI Mountain Bike World Championships, Kate Courtney noticed a shift in how people talk about women in sports

My father founded the notorious 120-mile Triple Bypass bike ride in Colorado. After a few failed attempts, I set out to finally complete it.

There's a fine line between dialing back exercise during the holidays and losing your fitness altogether

The basic foundation to help build your yoga mastery.

Plotting top-100 marathon times for the past decade shows that Eliud Kipchoge’s world record is a huge outlier. The question is why.

There's a lot to learn about the good life from sommeliers and hot-air-balloon pilots

The year in adventure fitness, gear, and sports was shaped by bold visionaries with world-changing dreams—and the mojo to make them real

At the 2016 world championships in Qatar, cyclists swallowed thermometer pills before competing. Here’s what scientists learned.

You can do a lot more with a foam roller than you might think

Meet the minds shaping and building the big business of the outdoors

From big-wall climbers to surf champions, these are the most dedicated, successful athletes of the year

We give you the gift of learning to fall

This week, we walk you through six daily exercises to boost mobility and balance.

The former white-boy rapper and mega-successful serial entrepreneur has become a bestselling wellness author and Tony Robbins-style life coach. His latest venture, a highly social weekend of walking up mountains until you drop, called 29029, is pitched as a new breed of restorative endurance event. But is this just a brutal group hike with good marketing?

The simple system is all you need for an effective full-body workout

It's never a bad time to re-evaluate your digital addiction

To become an Air Force pararescue specialist, you have to get through a brutal training course and stay underwater for a long, long time

Skiing is a dance. We consulted a pro skier and former ballerina to find out how to train for it.

You don't always have to go out to work out

A U.S. Army study aims to pin down the optimal staging protocol before high-altitude tests of endurance

Unraveling how a carbon fiber plate and space-age foam combine to make a more efficient shoe turns out to be trickier than expected

Nonprofit the Phoenix has a radical idea for those recovering from drug and alcohol addictions—get moving

The government just released new fitness guidelines, which we boiled down to a single, simple mantra

Convenience and versatility make for a winning piece of fitness equipment

Simplify your mobility routine with these three flexibility stretches.

How halfpipe skier Cassie Sharpe stays on top after winning Olympic gold

There's only one way to do 10,000 pull-ups in under 24 hours: Reset the limits of the human body

For years, female athletes have relied on training protocols, injury guidelines, and nutrition plans based on research conducted with men. That's starting to change.

(Courtesy Gaiam) Gaiam Restore Marbled Foam Roller ($20) The Gaiam Restore Marbled foam roller has a just-right semifirm density for soothing tight quads. Bonus: it looks good enough to keep in the living room. Buy Now (Courtesy Under Armour + JBL) UA Sport Wireless…

(Courtesy Teva) Teva Ember Moc Slippers ($75) The Teva Ember Moc slippers (women’s pictured) have forgiving polyurethane footbeds, hearty rubber outsoles, and cozy quilted uppers, making them the perfect after-class footwear. Buy Now (Courtesy Athleta) Athleta Hyper Focused Print Bra ($54) Athleta updated its…

(Courtesy Revere Cardio) Revere Cardio Vanilla Chai ($20 for 8) One packet delivers 15 grams of pea and rice protein and 20 grams of carbs from sweet potatoes to aid in recovery. There’s no better stocking stuffer for the endurance athlete on your list. Buy…

One thousand cyclists from across the country compete in the 200-mile gravel bike race known as the Dirty Kanza.

A new study suggests that hitting the gym more than twice a week is counterproductive. That seems unlikely.

Never underestimate the power of this simple fitness tool

The best way to improve your workout is to buddy up

The hemp plant extract is being adopted by athletes of all stripes to help reduce exercise-induced inflammation and support better sleep cycles

A new study suggests that running on autopilot is the most efficient approach.

This stretching routine will help make you faster, stronger, and injury-free.

A new study finds that having “elite” levels of aerobic fitness increases longevity relative to merely “high” levels.

Knee pain plagues athletes of all stripes. Here's how the experts handle it.

Success in sports or at work is almost never about a single monumental shift

Sidelined? Here's a little advice from the pros on staying sane—and coming back stronger than ever.

It depends—but you can hold your breath longer in cold water

Research on a pro cycling team suggests that subjective training metrics can match high-tech ones

Ross Edgley is in the middle of a 2,000-mile swim. Here's how that epic slog is affecting his skin, heart, and mind.

Most accomplished athletes, from Alex Honnold to Mikaela Shiffrin, have rituals they perform before a big day

Athletes and adventurers use rituals to get ready for big moments—whether it's wearing a new pair of socks on summit day or bouncing the tennis ball exactly seven times before bashing a serve. Does it work? Steven Kotler explores the cutting edge of neuroscience, plus a little bit of black magic, to find out.

Following the snow this winter? Here's how to train on the fly.

Michelle Parker loves long walks in the mountains. Here's how she trains for them.

What if striving to be great is what's holding you back?

Evolutionary biologists weigh in on the eternal training dilemma of how to allocate time and energy to three different disciplines

We're kicking off a new fitness column by surfing legend Laird Hamilton. First up: his top tips for performing at your best.

Stay nimble and beat stress while you’re on your next business trip

Jenni Gritters, a Power Vinyasa yoga teacher, walks us through nine common poses

Physiologist Alena Grabowski is studying whether prostheses give athletes a competitive advantage