Five years ago, Thomas “Rivs” Puzey competed in the famed marathon’s elite field. This year, he was happy to be among the last to cross the finish line.

An analysis of power data from pro cyclists quantifies the effects of hot and cold air temperatures on performance

I am pretty sure no runner who has consistently won races approaches their training in this way

You can’t run fast without using your arms—or can you?

Despite years of research, the athletic potential of Montmorency cherries isn’t as sweet as it sounds

The ultrarunning multi-world-record holder talks about sustaining longevity and the biggest thrill of her illustrious career

Can two and a half minutes of instruction turn you into a better athlete? Givego thinks so.

Bill Hayes’s new book, ‘Sweat: A History of Exercise,’ offers a personal account of a universal tradition

Your unexplained fatigue may be due to calorie deficiency, with serious implications for your health and performance

An analysis of pro cycling data finds that altitude-born South American riders race better at high altitudes than their lowland-born rivals

The oral health risks associated with heavy sports-drink use seem clear, but the evidence remains murky

Eating right looks different for athletes, and following vague nutrition maxims can have a surprisingly negative impact

Reflections on getting just a little bit older

New findings suggest that results from large training studies can’t be generalized to individuals

Follow our 12-week, effort-based plans to achieve your half-marathon goals and have a great race experience

A new study of identical twins shows that, despite their reputation as inert rubber bands, Achilles tendons adapt to exercise

Most studies on sports performance don’t include women. The team behind Stanford’s FASTR program is creating a new approach—and building a healthier culture for female athletes. 

New research explores how physical and mental factors affect how athletes raise their game when it counts

A popular training rule for endurance athletes faces scrutiny from skeptical scientists

A new study grapples with a familiar question: How much of athletic success is physical, and how much is mental?

The company’s newest flagship timepiece promises astounding battery life as well as efficient solar charging, and it comes with a flashlight

We tend to assume that a nice-looking stride is a fast one, but maybe looking good is its own reward

A training plan and general principles to guide your first foray into longer ultramarathons

Starting at five hours a week, this ten-week program will help you build endurance and jump-start your training this winter

Four years ago, the Minnesota phenom won historic Olympic gold in cross-country skiing, alongside Kikkan Randall. She was just getting going.

Scientists have figured out how to make simple exoskeletons that improve running efficiency. Should track and field authorities be worried?

Different workout styles can get you equally fit, but they affect your body differently—which suggests that you should mix it up

Looking to sign up for your first triathlon? We share everything you need to know to help you have a successful first race.

A new way of classifying athletes aims to quantify the thresholds that distinguish recreational athletes from their trained, highly trained, and elite brethren

Our Sweat Science columnist spent two months measuring his blood sugar around the clock. Here’s what he found.

This year’s predictions include fewer diets and a possible return of minimalist running shoes

Over the past decade, research into compression sportswear has exploded. Here’s what the results reveal.

After Lawlor Coe lost his brother Hunter to tragedy, he did everything he could to avoid his pain. Then he began to run.

It’s time to break out the merino base layers and the heat-exchange breathing masks

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

The genes that make some people vulnerable to a fatal heart stoppage may be the same ones that give them an athletic edge, researchers suggest

Sports medicine physicians are rethinking the relationship between damage to your body and how it feels

Mike McCastle has found a very unusual way to benefit others: by enduring agonizing physical challenges

As skimo prepares for its Olympic debut in 2026, sports scientists explore the sport’s demands

Your GPS watch and other gadgets are great at describing training, but prescribing it is a harder challenge

A visit to Eliud Kipchoge’s Kenyan training camp reveals how he dominates the marathon world

A mathematical model explains how endurance and speed come together to determine who will win a last-lap sprint

How two rival teams fought storms and sleep deprivation to claim an 18-year-old paddling FKT

A new study quantifies the effects of running on technical terrain

A new study uses machine learning to quantify the effects of temperature, humidity, heat, and sun

Make sure to include these smart, specific workouts in your half marathon training to land you that PR.

Scientists take their equations for the energy demand of hills and rough terrain out into the real world

The link between serious cycling and poor bone health is well established, but researchers are still debating what to do about it

Over the past few years, McCastle has completed 5,804 pull-ups in a single day, pulled a 5,000-pound truck across the Mojave Desert, and climbed a rope the equivalent height of Mount Everest. How on earth has this Navy SEAL dropout accomplished some of the craziest physical feats in recent memory?

The physiological differences between men and women affect how much fluid they store, how they sweat, and how quickly they heat up. Does that matter?

Yes, people sometimes die while running. No, that doesn’t mean running is “dangerous.”

A new study investigates how different types of physical performance are affected by the time of day

A new study suggests that hydrogels enable you to down more carbs with less digestive distress, and race faster as a result.

A new study measures the physical and cognitive load of four different treading techniques. The key? Generate lift.

Aging doesn’t mean you have to stop getting stronger. Here we’ve provided training tips for continued improvement.

Regular exercisers drink more, a new study confirms, but are less likely to be problem drinkers

Supersapiens’s new continuous glucose monitor promises to help athletes manage their energy levels. But can it really stave off a bonk?

It’s not exactly fun in the moment, but after, you’ll say it was the best time you ever had

A long-running gym debate about whether to train each limb separately comes to the cycling world

In order to achieve his first UTMB win, the American ultrarunning star is taking a whole new approach: rest

Endurance-science experts explain the world record holder’s incredible marathon dominance

A new study of Western States ultrarunners illustrates the power of looking beyond simple risk factors to predict injury

Scientists have been debating whether muscles contract more slowly as you age, but new data suggests the real problem is a loss of strength

After years of debate on the dangers of “too much exercise,” researchers sum up the state of current knowledge

Exercise and digestion often don’t mix well, but scientists are on the case

Israel Start-Up Nation’s physiologist Paulo Saldhana explains the data—and the feelings—that determine who attacks when in a cycling race

In her new book, ‘The Joy of Sweat,’ Sarah Everts answers all of our writer’s questions about perspiration

They’re deceptively straightforward, but if you can follow them, you’ll see the benefits

It’s the simplest and cheapest performance booster available, so why don’t elite athletes take advantage of it?

As events as big as the Olympic Trials get rescheduled because of heat, we went to the science to find out how you should decide when it is too hot to run safely

It turns out we have a lot in common

New research fine-tunes the details of heat adaptation

When an elite cyclist attempts to ride a bike as far as possible in an hour, one thing is guaranteed: they will hurt like never before

A spiral of injuries—and the attendant existential crisis—can be an opportunity to revisit the fundamentals

Tuliamuk had secured her spot in the Tokyo Olympics—then 2020 happened. Fortunately, she’s always run for more than just the medals.

There you are, at the bottom of a hill, on foot, or on your bike, or on skis, ready to start up. But are you really ready? Here are a few strategies you might consider. 1. Choosing More Pain for Less Time by Going Faster over Less Pain for More…

These tools are suitable for beginners and hard-charging athletes alike

Do you jog around the block at the end of a run so your mileage equals a nice round number?

The Saxx Hot Shot outperformed every other top in my quiver

Hiking can be a blast, but it won’t be if you're struggling every few feet. Here’s how to get ready for trekking, from easy day hikes to the longest thru-hikes in the world.