‘In Constant Motion’ follows ultrarunner, Adam Campbell, as he returns to trail running after a life-threatening fall.

The first Golden Globe Race, a solo, nonstop, around-the-world sailing event held in 1968, was a mixture of triumph, tragedy, and madness—all chronicled in a classic bestselling book and recent BBC movie. Fifty years later, 17 sailors are once again setting out for the most ambitious—and loneliest—regatta on the planet.

Protect your eyes on trails, roads, and crags with these pro recommendations

It's not just running. Two new studies confirm that weightlifting provides a similar boost to mental health.

Don't fall in the trap of more is better

While recovering from a terrible accident, the ultrarunner discovered a new part of her identity that went beyond her sport

Conventional wisdom says that drafting doesn’t matter when cycling up steep hills. It’s wrong.

Rule #3 when it comes to training for exertion in high places? Adjust your expectations.

Build a better butt to carry you through any activity

It feels good, but does it boost performance? Only randomized controlled trials can tell us.

New research compares men’s and women’s pacing patterns, and finds some telling differences

You don't have to lift less as you get older—you just have to make a few adjustments to your training

Summiting the world's tallest peak puts humans through some of the most extreme conditions on the planet

Researchers explore the psychology of running injuries

After all, you shouldn't have to pay $20 for a class every time you want to get your stretch on

Legendary gymnastics coach Christopher Sommer tells Tim Ferriss why all athletes benefit from a smarter approach to strength training

Or at least that's the thinking among the elite athletes who are adopting treatments that were once considered fringe. A former EMT turned acupuncturist weighs in on the movement.

Follow these pros' lead and turn your phone into a fitness tool

The do-it-all staples—from $11 to $515—that these multisport pro athletes can't do without

'Play On,' a new book from journalist Jeff Bercovici, explores how aging elite athletes stay at the top of their game

Turns out, even if you don't play basketball, you can learn a lot from the sport and its athletes

Make gym time more than tolerable

Make gym time more than tolerable

Bonking is never an option

Details matter when it comes to keeping workouts fresh

The tennis superstar describes her favorite exercises and how she keeps a level head in tough moments, on and off the court.

We asked a writer to spend one month going as hard as he wanted to—or didn't want to. Here's what he found.

The post-exercise recovery trend has produced mountains of new research. But can you trust the results?

Products based on the age-old concept of vibration therapy are cropping up everywhere, and athletes are some of their biggest advocates

Thanks to smartphones and watches, athletes can track more data than ever. But is HRV all that really matters?

Turn your hands into powerful tools

It used to be that we all slowed down with time. Not anymore.

A long-standing debate on how to optimize your endurance efficiency gets a new infusion of data

The less you worry about making mistakes, the better you’ll perform

If you pick the right class, it's an invaluable tool for building strength, flexibility, and resilience

Two-person teams trade in their cell phones for traditional navigation tools and attempt to travel over 1,200 miles through the desert.

On Saturday, March 17 Mike Foote set out to push the boundaries of ski touring to the next level.

The anti-inflammatory is extracted from the marijuana plant. Is this bud for you?

A new study explores why we're stronger and faster when someone is watching

We’re a competitive bunch. Here’s how we stay fit enough to keep up.

I'm approaching 30 and haven't competed in years, but that pre-race dread is much bigger than running

Pain psychologists explore the differences between those who finish ultra-endurance races and those who don't

The vests, bags, belts, and more that top athletes use to stay primed while they push

For serious performance gains, focus below your ankles

Sometimes, when it comes to making progress it's the smartest choice you can make.

An analysis of five decades of world records reveals a surprising shift in pacing approach

To get the most from your performance, you have to accept the unpleasant—and keep pushing

Your foam roller can do much more than just release tight muscles. Use it to strengthen and tone your whole body.

Because beach season is just around the corner

Don't overlook the most important part of your training cycle

Researchers at Stanford and UCLA are teaching college distance runners that when it comes to staying injury-free, what they eat matters

A seasoned biomechanics expert offers his top insights on running-form danger signs

For the first time, the International Olympic Committee is researching what it takes for new moms to return to high-level competition

The feature-loaded, do-it-all smartwatches that give elites a competitive edge

An otherwise fit 42-year-old, I had the range of motion of a sycamore.

The entrepreneur believes that biohacking can rocket your body and mind to peak performance. His Bulletproof diet zoomed into the mainstream, his Bullet-proof coffee has everyone quaffing butter, and his Bulletproof books fly off the shelves. Now Bulletproof Labs is out to hack, well, everything.

Thanks to new equipment and a more holistic approach to training, they turned a dismal 2014 showing into a commanding lead this year

A comprehensive research review finds that "neuromuscular" gains boost your speed and efficiency

The tools and tricks the pros use to stay injury-free

Until recently, the Nike track star seemed destined for burnout. But last year in Boston, after a wave of disappointing races and a personal tragedy, she ran a record-shattering debut marathon. Will the new distance of 26.2 miles save her career?

Our columnist literally wrote the book on peak performance, but he had to reconsider everything after an unexpected battle with mental illness

The world’s first four-minute miler has died, but his approach to the sport should live on

The (surprisingly affordable) tools they use to build strength, power, and stability

Sports psychologists weigh in on the challenges of being among the best in the world

The surefire way to make sure you're getting the treatment you need

Eight life lessons from one of America's best marathoners

Athletes have been shattering "expert" forecasts for the ultimate limits of our species for more than a century

It may be the key to happiness and sustainable performance

There were a lot of mistakes in that recent story. Let’s set the record straight.

Erin Jackson is the latest Olympic athlete to join the two-decade tradition 

Don’t overlook this crucial piece of your wardrobe

Good fitness is about more than just powerful legs and core

Yes, curling makes the list. And no, we're not biased at all.

In an exclusive excerpt from his book 'Endure,' Outside's Sweat Science columnist explores the brain's role in setting our physical limits.

All season athlete Dane Tudor knows that the key to performing out in the mountains is to train hard inside. This is his most recent film about that pursuit, No Shortcuts.

Can a controversial new form of statistical profiling weed out cheaters?

Make 2018 the year you actually follow through

New research finds that performance varies drastically based on the time of day

The hype around a new breed of running tech is raising the ire of biomechanists. Here's why.

In gyms around New York City, the Women's Strength Coalition is working to make the lifting community more inclusive