New research zeroes in on an unlikely culprit for why running gets less efficient as you fatigue.

Garmin and Apple are among a recent wave of companies who’ve entered the stress tracking market. Do the products live up to their claims?

Building buff digits might take less time than you think, according to the Spanish scientist

They're mighty comfy and don't have that sloppy sweatpants look

Build a better butt to carry you through any activity

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

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.

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.

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

The Versa, which debuted Tuesday, pairs heart-rate tracking with new health features and a sleek look—all for $199.

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

Good fitness is about more than just powerful legs and core

Build up your back muscles to gain power and prevent annoying aches

How do we know them already? Because we asked some of the brightest minds in the business.

Cool down, then follow this step-by-step guide to reduce your risk of injury and maximize performance

The tech giant’s latest foray into the fitness market: make exercise machines smarter

One of the most neglected parts of an endurance athlete's body is also arguably the most important

You can tweak your workout to minimize the downsides of sucking on a tailpipe

Finland shares an 833-mile border with an aggressive and unpredictable neighbor. That proximity led to a major conflict during World War II—the horrific Winter War—and even now it keeps Finns nervous about Russia’s intentions. David Wolman suited up to train with the elite soldiers who will be on the front lines if this cold feud ever gets hot.

Eight packable products that make workouts on the road as easy as room service

All the essentials, from $15 to $330, that make exercising more fun

We're partnering with the Los Angeles-based company to help you (and us) finally get fit

Ignore the urge to post a heroic effort and focus instead on the daily grind of steady improvement

From grippy socks to callused palms, a quest for an exercise silver bullet

You might be able to stop them before they even happen

The most unsettling part is the loss of purpose

Fancy workout studios and alternative fitness methods are having a moment. We determined which ones will truly bring you closer to your goals as an outdoor athlete.

Build your way up to the perfect box jump, then try these three progressions for continued results

Sure, it's fun and relaxing—but it can also be a key part of a fitness routine

If $75,000 represents the “perfect” salary, what’s the performance equivalent when it comes to cardio, diet, and time outside?

It's not just an upper-body exercise. Nail your form, then try these variations to improve your stability and strength from head to toe.

Nail the basic form, then ramp it up with these five creative variations for better, stronger results

One move is all it takes for a strength-building workout that also leaves you breathless

The hardest part about your athletic pursuits may be building a long-term relationship with them

We all want to trade the indoor workout for time in nature's gym. But before you do, master these four ground movements to make your running more effective.

Beau Kittredge is fittest athlete you’ve never heard of. Here’s what a day in his life looks like.

Master this basic move to build a strong core and stabilize your movement

Mastering ground movement—crawling, rolling, and standing—is a vitally important, often overlooked aspect of becoming a well-rounded, injury-free mountain athlete

Nail this move to create a solid base for your endurance feats

Rock climbers from around the world suffer under Patxi Usobiaga. But why?

Sitting can be lethal, right? We asked the experts how to stay healthy while doing the one thing that, for the most of us, takes up the majority of the day.

These exercises are perfect for the outdoor athlete looking to get stronger and faster while staying injury-free

After most MCL and ACL surgeries, doctors focus on treating and rehabbing the soft-tissue, while almost completely ignoring motor patterns and biomechanics

It takes one piece of equipment to build strength, endurance, and total-body power

Pair your regular workouts with this outdoor-friendly routine for superior strength, stability, and endurance

We asked the experts how to diagnose, treat, and prevent running's most frustrating, most common injury

Recent studies suggest that walking the webbing may boost balance, speed rehab, and keep your knees injury-free

You have no excuses for first-day noodle legs—these seven easy moves will get your legs back in skiing shape from the comfort of your living room

With winter quickly approaching, we’re getting pretty excited for ski season here at Outside. We caught up with pro skier and trainer Crystal Wright to learn some ski-specific workouts to get in shape for the slopes.

These eight items don't take up much space. Buy them all and you'll be better outfitted than any pricey gym.

Developing flexibility is just as important as developing strength. Here are the best moves to make you a healthier, more efficient all-around athlete.

Being fit is about constant movement, and children are in constant motion during playtime at the jungle gym. Why not join their lead?

Stay in the game longer and stronger with a solid prehab routine, and go harder with a smart recovery routine

Step one, drain the keg. Step two, get super strong.

As the trends have swung from minimalist slippers to fat shoes and back again, one thing has remained the same: to avoid injury, you need burly feet

Dominate your favorite sports without any weight training

The classic strength and power move gets a makeover, giving you even better benefits

Forget complicated workout regimens. CrossFit phenom Christmas Abbott shows simple strength exercises are all you need to start feeling fierce

Boost reaction time and reduce clumsiness on the field with these expert moves.

They help you break falls and climb walls. Here's how to keep them strong.

Researchers are showing everyday athletes how to train their brains to perform like the pros

When’s the best time to use a foam roller, before or after a workout?

Have trail and gym work turned you into a stiff? You need some flex time with Ashtanga yoga.

Your foundation is built. It's time to tweak the beast.

Fine-tune your fitness with balance and agility exercises. Here's how.

To keep a workout program fresh, you need to make it your own, and some days you need to break the rules—within reason.

How fit do you really need to be to scale the highest peak in the world? An expert weighs in.

The science around strength training has changed in the last decade. You’re older, stronger, and hopefully, smarter now. Don’t make the same mistakes you made in your high school weight room.