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

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

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

Looking to trim food costs? You’re not alone. These Costco staples help athletes eat better and save money at the same time.

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

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

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.

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

If you want to up-level your running, here’s how to get a jump on the new year

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

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?

Whether you’re hiking over rough terrain or going for a walk around the block, rucking is an easy way to add in resistance training

More evidence emerges that muscle-fiber type matters—if you can figure out which type you have

An excerpt from Brendan Leonard’s new book ‘Ultra-Something,’ which explores why we’re so drawn to the long haul

Scientists recently examined the physiology of the increasingly popular open-ended race format—running 4.167 miles every hour—pioneered by Gary Cantrell.

An adventure is an idea. It doesn't even have to be a good one. Here's a helpful guide to dreaming them up.

Don’t stress about what to get your fitness-obsessed friend—we’ve got you covered

From Swedish Fish to fun-size Twix, I tested Halloween candy as fuel for long runs. Here’s how they compare to traditional sports nutrition—and ones that won’t haunt your training.

We lose power more quickly than strength as we get older. Researchers are trying to understand why—and how to fight back.

Research on athletes who are experienced meditators finds better “response inhibition” and superior endurance

Our Dear Gear columnist breaks down the benefits—and potential downsides—of buying a super shoe

A new study tests the performance claims of Omius’ unique looking headband worn by Olympic legends Sifan Hassan and Eliud Kipchoge.

Researchers were once convinced that some people have a bigger training response than others—but the data says otherwise

After running myself into the ground for the hundredth time, I had a realization that let me give myself a much needed break

Researchers in New Zealand used athlete data to pick up patterns in how we recover. Their insights are surprising.

If you feel like your athletic performance is falling short, this new research might explain why

New technology is distorting track records. Ethiopian running legend Kenenisa Bekele makes the case that his world records are superior to the current ones.

Our photographer traveled the Western States Trail Ride, covering its 100-mile length through California’s Sierra Nevada, to document the horses and riders taking on this grueling challenge

If rising temperatures have you clamoring to stay inside until fall, you can adapt your body to them and thrive on the trail

Everyone knows how to run. Now biomechanical analysis may teach us how to do it better.

Military scientists have developed an equation for how many calories it takes to haul weight in different ways

Some of the most hardcore athletes in the world are elite race walkers. Moving faster than most people can run, their sport pushes the limits of endurance, pain tolerance, and fueling.

A new study suggests men and women should address age-related declines in aerobic capacity quite differently

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

“Predictive processing” offers novel ways to think about sports psychology, the limits of endurance, and the urge to explore.

Our Sweat Science columnist tries out the heat adaptation protocol used by Oregon runners, and survives (barely) to tell the tale.

A trove of ethnographic data reveals that persistence hunting—early humans relying on superior traits to chase down prey—was a worldwide phenomenon

Three days in total blackout darkness doesn’t sound that hard, until you hear this story about someone who tried to do it

Wunderkind Jakob Ingebrigsten may have lost (again) on Saturday at the Prefontaine Classic, but don’t expect his unorthodox training approach to disappear

Scientists are finding that the subjective perception of time during exercise is more complex than expected.

Having a high VO2 max is great, but research is showing that the key to elite performance is maximizing something called fatigue resistance

There are lots of theories about how to avoid altitude sickness. But in practice, acclimatization isn’t so straightforward.

Athletes train for years to overcome pain, exhaustion, and fatigue. But some people take it too far and are never the same again.

The fitter you get, the more likely you are to feel that you can’t get enough oxygen during hard exercise

Contrary to what scientists once thought, even superficial cooling is enough to interfere with muscle oxygen supply.

Arbitrary goals are nonsensical. They also can be the source of great joy.

Singer-songwriter David Lindes found his way into running with help from the most unexpected teacher: a bull moose

Embarking on four days of total blackout, inside the sensory equivalent of a tomb, our writer went on a dark-cave retreat, the same one that quarterback Aaron Rodgers did

Look around the start line of an endurance race and you don’t see many tall competitors. Look on the podium, and you never see any. Why is that?

The benefits of training your mental skills are, by definition, all in your head. So how do we prove that it works?

The two pursuits have more in common than meets the eye

How do you make the best of a golf addiction? Add running.

Marijuana is still a banned substance for athletes, but new research is chipping away at the idea that it makes you faster

The logic is good and the anecdotes are common, but the evidence is shakier than expected, researchers find

Colin Gay, a 48-year-old father of two from Virginia, is doing something that few of us could ever imagine

New research suggests exercise may boost the “love hormone,” the latest in a long line of brain-boosting molecules

What’s an acceptable baseline of fitness? According to the most adventurous American president in U.S. history, it was an ultra endurance trek.

Our strength-running coach recommends occasionally going off script to reach your running goals

The pursuit of performance in a bottle inherently undermines our attempts to get faster, stronger, and healthier, our Sweat Science columnist argues

AI is improving with hyperspeed sophistication. Can it prepare you for the most beloved marathon in the world?

Is Taylor Swift an elite endurance athlete? On the Eras tour, the singer-songwriter is performing three nights a week, singing and dancing for as long as it takes most people to run a marathon.

InsideTracker’s massive database of more than 23,000 runners shows that more mileage is associated with better biomarkers

After a certain number of hours, endurance races are basically eating competitions

Adults will take recreational cues from their children, “unprocessed” will become a marketing asset, and rodents will show us the way to eternal life. 

It turns out you can absorb more carbohydrates than sports nutritionists thought. But does it actually make you faster?

The 26th president once demanded that military personnel be able to walk 50 miles in 20 hours. I set off on an ill-fated mission to see if I could do it myself.

In the form of a handy little email, or a push notification, anything to remind me that I’m not heading too quickly toward the afterlife just yet

We try to gain a competitive edge from things like nutrition, recovery, weight training, and new shoes. But what if becoming a parent does the trick?

You felt fine a day after your long run—so why the heck are you slogging through your easy workout two days later?

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

Over the past century, “maximal oxygen uptake” has turned out to be a valuable marker of both endurance and health.

You won’t freeze your lungs exercising outdoors this winter, but there are reasons to be cautious about inhaling extremely cold air