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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.

What separates the best endurance athletes from everyone else isn’t their amazing lab test data or power values—it’s how well they maintain those values after a few hours of exhausting exercise

And here’s why

Champion endurance athlete Rebecca Rusch figured her quest for enlightenment on the Iditarod Trail would hurt. She was right.

The newly revamped TrainerRoad cycling app uses an advanced algorithm to create training programs custom-tailored to the user. Our writer gave it a go.

Running alone against the clock is very different from trying to beat other runners, but untangling how our minds process the challenge is “like knitting with spaghetti”

A new review assesses what it takes to maintain endurance and strength when circumstances interfere with your usual training

Staying in hiking shape during the off-season is a serious challenge, but it’s not impossible

Changing hormone levels affect your tendons, ligaments, and muscles, and evidence is mounting that this can influence your chances of injury

Mental fatigue has become a hot topic for sports science researchers, but its effects remain controversial

At the 2019 World Championships, researchers gave marathoners and racewalkers swallowable thermometer pills and used thermal cameras to assess the effectiveness of hydration and cooling techniques in the heat of competition

Detailed power data from sprinter Marcel Kittel and climber Tom Dumoulin highlight the contrasting physiological demands faced by different riders

Tallying which articles are most frequently cited in later studies reveals the biggest trends in sports science—and some oversights

Unlike heat training, repeated exposure to cold doesn't necessarily help you handle winter weather better

Pronation is out of favor, comfort is too vague, but maybe measuring your "habitual motion path" will guide you to a shoe that minimizes your injury risk

Top trail runners mix running and walking on steep terrain, but even scientists aren't sure how we choose which is better

A leading company redefines what it's actually measuring, and explains why that's what we really wanted all along

Swap your protein shakes for these cozy beverages packed with protein and electrolytes

A new study explores the links between exercise and pain perception, and how easily they can be manipulated

After half a century of confusion, researchers have a new perspective on the transition from "aerobic" to "anaerobic" exercise

When you stop breathing, oxygen flowing to your brain actually increases—at least for a while

A basic principle of training says you get better at the things you do most. So why does cross-training work?

You don’t need an elaborate workout plan to get the most out of your resistance workout; you just need to tune into how you feel

Biology suggests that decades of running should invariably blow out your knees. Scientists are trying to understand why that doesn’t happen.

Even compared to athletes from other sports, endurance athletes have a unique relationship with discomfort

A new study asked coaches to rank the most economical runners after watching video footage. It didn't go well.

A new analysis casts doubt on the idea that people are born as "responders" or "non-responders" for training in thin air

A new study suggests that strength training is more important than electrolytes for preventing cramps

Should all your training be hard? Do you need to stretch? We've got answers.