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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.”

Build strength and alignment to help eliminate overpronation and protect your feet and ankles

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

The case of 24-year-old Daniel Granberg, who died of high-altitude pulmonary edema earlier this month, highlights the danger of altitudes well below the Himalayan “death zone”

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

These tips will help you build up to your running goals and stick to your plan.

Expert strategies and intuitive tech to help you set and achieve your goals

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

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

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

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

A physical therapist explains why your wrists hurt, and how to rehabilitate and protect them

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

Electric muscle stimulation claims to be a more efficient form of exercise. Here’s how it holds up.

You might not be a wildland firefighter, but that doesn’t mean you can’t train like one

Most core workouts target your abs. But to build a properly strong core, you need to strengthen the other essential muscles supporting your core. Here’s how.

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

When you're running in high temperatures, here's what you should know about adjusting your pace—and still getting the same workout intensity. We dig into the science of swelter.

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

After years of shredding on a screen, our web producer went outside to try the real thing. Plus: a one-month ollie training plan.

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

Answers to the questions you’ve always had about perspiring but were afraid to ask

Whether you’re looking to transition from pavement to dirt or just log more and faster miles off-road, Saucony athlete Katie Asmuth has you covered with hard-earned tips and advice

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?

Push too hard when it’s hot outside, and your dog could develop exercise-induced heat-related illness

A step-by-step guide to help you build up to the ultimate lower-body move

Five years after the Vaporfly upended marathon running, track shoes are set to star in Tokyo

It turns out we have a lot in common

New research fine-tunes the details of heat adaptation

Work your balance and core strength with these functional exercises

The secret to pushing past your mental limits could be a handful of coins

Tips and tricks to master the Turkish Get-Up

A new study shows measurable gains in strength from a purely imaginary training program

Elevate your strength routine with this effective, versatile tool

The physiology of events like the Ultra-Trail du Mont-Blanc is radically different from “short” events like the marathon

Working stabilizer muscles can lead to big gains in and out of the gym

Instead of focusing on joint angles and limb movements, a new study takes a holistic approach to the biomechanics of elite runners

Looking to level up? Get started with this inexpensive, four-move routine.

A body in motion will inevitably need a little maintenance

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

Dealing with discomfort isn’t a magical gift. It’s a skill, and you can improve at it.

New research sifts through the evidence to figure what types of intervals make you fastest

All types of athletes can benefit from quicker instincts

The former Harvard rower is making the most of a six-month sabbatical from his new job at Zwift

In a new event for �����ԹϺ���+ members, meet and train with the stars of Team USA

Exercise causes pain, but it also dulls it. Researchers are still trying to understand how that works.

Techniques to see success and overcome obstacles in your next race

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

A new study tests how much cycling it takes to maximize cognitive function in endurance athletes

What you should know about safely returning to sports after pregnancy

The latest deaths raised questions about the role of COVID, but analyses of nearly a century’s worth of climbing records suggest some consistent patterns

The humble plank is the single most effective training exercise for your core musculature

A new study looks for adaptations in the placenta, and finds positive effects from exercise during pregnancy

Researchers are searching for telltale clues in your strength, flexibility, or body position that signal an impending injury. It’s harder than you think.

Expert tips for keeping your dog healthy, happy, and keen for any type of outdoor activity

A new analysis digs into who overheats and which conditions are most risky, with surprising results

Setting high goals is great, but how you deal with falling short determines how long you’re willing to keep chasing them

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

It’s easy—maybe a bit too easy—to believe that poor sleep leaves you more vulnerable to injury. But researchers aren’t so sure after all.

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.

Maintaining the ability to hit top gear after your twenties is useful even for endurance athletes, and takes specific training

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

Allen is a specialist when it comes to charging hard on rough trail. The new VECTIV shoe line is helping get her where she needs to go, fast.

Round out your training routine with exercises to help build explosive strength

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

Three full-body movement progressions on the parallettes that you can do at home

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

Is it possible to stay in shape at home without spending a fortune? Wes Siler details his gym setup.

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

A new study explores how inner monologue varies between sports, situations, and experience levels

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

A new study plots the progression of thousands of people following an ultra-minimalist training plan. The results are impressive—at least initially.