The good news? You can limit some of that damage by strengthening the muscles that keep you upright.

This week, President Trump announced that he's bringing back the Presidential Fitness Test to gym classes across the nation. Here's what the 'Outside' edition would include.

These moves are yoga instructor-approved and help release tension in the muscles surrounding the spine, glutes, and hips

Now that the fastest marathoner in history, Ruth Chepngetich, has been caught, is it time give up and let athletes dope?

Scientists explore what’s happening in our brains during prolonged efforts

Even a light weight can give you results

You've probably been overdoing it

"Never outrun your joy of running.” —Julie Isphording. How to train and fuel well as a runner.

A weighted vest is an easy way to add some extra resistance to your strength training routine. Try these five weighted vest exercises.

Thinking of taking the 13.1-mile plunge but not sure where to start? This half marathon plan will carry you from the sofa to the start line—and across the finish, too.

Patterns emerge in a database of more than 100 trail-running fatalities

Training plans for those who have never run before to runners looking to improve their performances

What we learned about the power of the mind, drafting, pacing, and more

One of these moves requires a bath towel

At Nike’s Breaking4 event in Paris, the Kenyan star clocked the fastest ever mile by a woman. Here's how she did it—and why the 4-minute mark remains elusive.

Our Sweat Science columnist is on the ground in Paris for Nike’s Breaking4 race on Thursday

I’ve spent the past four years twirling, shaking, and rolling around on the floor with strangers and it’s given me more answers than I can count

Repeated twisting of the uppermost part of your spine can lead to laxity and instability; sports doctors recommend safer options

Six years ago, Nike orchestrated the world’s first sub-two-hour marathon. Now, the brand—and Faith Kipyegon—are going after the women’s mile with a high-tech suite of shoes, apparel, and race-day strategies.

Spine doctors say hiking can be a surprisingly good source of back pain relief—but the way you hike matters.

Your watch or wearable isn't actually the most accurate way to determine how hard your last workout was. This completely analog method is.

Chilling on your belly is very, very good for your spinal alignment.

A new approach to endurance training involves inhaling carbon monoxide—and is reviving old debates about dying to win

These yoga poses can help you conquer your next mountain with more mobility—and less pain.

These moves will prep your lower body and help you avoid injury

According to new research, keeping two repetitions in reserve is almost as good as maxing out every set of your strength routine.

Physical therapist-approved moves to warm up your arm, back, and chest muscles

Lactic acid has long been vilified, but new research shows that it doesn't impair muscle function. In fact, it might actually be good for you.

A new study shows the once-popular marathon supplement could offer significant endurance gains.

The Fast-R Nitro Elite 3 claims to offer the biggest improvements in running economy since the Nike Vaporfly took the world by storm eight years ago.

Placing purposeful pressure on yourself can challenge your mind and body in a good way

The best part? You can do these in the comfort of your bedroom.

You have big training goals. Here’s how to maintain the motivation to match.

The key to flexibility, mobility, and comfort is as effective as it is affordable

Chronic inflammation increases as you age, but serious training can help you avoid it.

For days when a gym session is off the table, a collection of at-home strength training gear can give you a full-body workout with zero wait time

New data explores the complex links between your apps, mental fatigue, and athletic performance.

An ACE-certified trainer shares exercises to keep your muscles moving on the days you're not doing (or don't feel like doing) a high-intensity workout

The aches in your back, hips, and knees could be signs to work on your abs

How elite running team the Brooks Beasts fuels up for spring training

The risks of training while depleted are finally getting lots of attention—maybe too much

I walked 62,804 steps around Manhattan. Somewhere around mile 20, I realized that slowing down didn’t need to mean falling behind

Scientists tackle the challenge of maintaining qualities like high VO2 max and good running economy even when you’re tired

It’s either way more than you think or way less than you think, depending on which scientists you listen to

Two new studies add fresh data to the debate about exercise and brain function

Expert-approved ways to warm up your ankles calves ahead of your next workout

The barrier is closer than it seems, researchers argue—if you fully optimize drafting and other logistical details.

Ditching the data and simplifying my runs for a month had some unexpected side effects. Here’s why you should try it.

If you strength train or hit the gym in general, these yoga poses will feel very familiar to you.

Core-strengthening can look like a lot of things—even a yoga pose. These practices enhance stability, support, and the way you show up for go-to sport.

New data suggests that the most efficient uphill slope is steeper than you think

Whatever kind of strength training you practice, these stretches can help prevent aches and pains

Mick Jagger is in incredible shape—for a person of any age. How does he do it? I followed his training plan to find out.

Here’s how Peloton instructor Matt Wilpers suggests structuring your indoor bike training

Understanding when and why men outperform women, and under what circumstances that can change, is suddenly a fraught topic.

Whether you’re a skier or not, some of the most common aches and pains can be traced back to hip weakness and instability

Follow these expert parenting tips to share powerful experiences with your children, build a foundation for lifelong adventures, and foster a love of nature

When John Orth, a violin maker from Colorado, set out to break his own world record for the most pull-ups in 24 hours, he had no idea he was competing against a college kid from Virginia

A new study found that people who cram all their exercise into a couple of days a week—so-called weekend warriors—reap similar health benefits as people who work out throughout the week

Winter can be a tough time for athletes. Motivation an issue? Or can’t do your favorite workout? No problem. This comprehensive guide will help you stay fit all winter long.

New data from 2.5 million marathon finishers finds that subtle changes in air quality can affect your race time

Ben Patrick is better known as the Knees Over Toes guy: a viral internet personality who believes that the oldest rule in the weight-training book is dead wrong. Our writer tried his protocol to see if it could solve his chronic pain.

New data shows that the biggest difference between elite and middling runners is how much time they spend jogging

Everyone knows taking time off is good for you—in theory. Maybe these new results will convince you to actually do it.

It’s time to throw your training plan out the window. Welcome to the new rules of fitness and nutrition.

Getting yourself a new pair every so often can help you perform at your best and avoid injury

Simplify your fitness routine as you travel for the holidays with this customizable full-body workout

Keeping your muscles cool will supercharge the benefits of aerobic training, new findings suggest

By triggering a diving reflex, athletes who perform breath-holds can increase red blood cells—and, possibly, endurance

The key to stretching properly is knowing when to do static or dynamic stretching

22 months. 5 continents. 149 performances. And 6 ultras. As the Eras Tour finally wraps, here it is by the numbers.

Scientists crunched the numbers to come up with the single best predictor of how long you’ll live—and arrived at a surprisingly low-tech answer

A veterinarian by day and ultrarunner by night, Paris became the first woman to complete the notoriously hard race this year

A selection of (mostly) new titles for fans of science, endurance, fitness, and adventure

After years of rumors, new data suggests that real-time lactate sensors are finally ready to hit the market. But will athletes know what to do with them?

'Gladiator II' hits theaters on November 22. Here's what we know about how real gladiators ate and exercised.