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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

Avoid these mistakes and master the complex full-body movement

Embracing recovery will make you a better athlete. Your body is asking you to work in. It’s time to listen and respond.

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

Five gentle weighted moves to help you progress over time

A pro marathoner looking for a sponsor takes a scientific approach to finding the right match

The mental and physical benefits make it worth the extra effort

To pick their two-hour marathon team, researchers tested some of the greatest runners on the planet. Now they're revealing what they found.

Bust your gut like the gold-medal-winning cross-country skier

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

A new review sifts through the evidence for and against hiking with poles

A new study suggests that slow-twitch runners can handle higher mileage than fast-twitch runners before showing signs of overtraining

Proven tips from top athletes on how to nail the perfect morning adventure

Follow these tips to avoid excessive burping, gurgling, and nausea

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

This expert advice will help you get out of a rut and take your skills to a new level

You're never too old—or too good—to brush up on your technique

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

This three-move bodyweight routine is all you need to improve athletic ability

Experienced runners tend to match their breath and stride patterns, but trying to do it deliberately may backfire

Five simple strategies to stay motivated as the seasons change

How the practice continues to comfort the former big-wall climber after a life-changing spinal injury

The disruptions of 2020 mean that there’s an unusually large crop of endurance-related books hitting shelves this fall

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

A handful of apps are rebranding the menstrual cycle as a female athlete's untapped superpower. Here's what you need to know about them.

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

We’ve partnered with WHOOP and Tracksmith to create a first-of-its-kind running recovery program—and we want you to join.

It’s the one training metric virtually all runners track, but running scientists think we can do better

With a little help from technology, Joshua Cheptegei took down the 5,000-meter world record in Monaco last week

After a controversial Australian study's negative findings about low-carb, high-fat diets, scientists made adjustments and ran the study again

Keep your fingers, shoulders, and back happy with these nine strength and mobility moves

After an exhaustive search of the literature, researchers conclude that, well, it's complicated

When the going gets tough, which sensation actually slows you down?

The ability to sustain a high rate of energy burn for a prolonged period of time may help ward off cancer

The hotter it is, the closer we come to the ever elusive goal of besting the horse—which supports the evolutionary "born to run" hypothesis

Use tempo and isometrics to improve your bodyweight routine

Three new studies explore iron patches, injections, and dose frequency

Sweaty workouts do enhance your endurance, according to a new theory, but it may take longer and function differently than previously thought

To mark the start of his sixties, Will Turner swam, biked, and ran 14,765 miles, many of which took place through iconic national parks and public lands. Here are the most stunning photos from his "races."

A new aerodynamic analysis runs the numbers on exactly where to run when you’re behind someone else

Put that bouncy desk chair to work with this full-body strength routine

When CEO Greg Glassman retired after making inflammatory comments about George Floyd, many in the fitness community weren't surprised. But where the popular fitness business goes from here is anyone's guess.

A decade after 'Born to Run' made them famous, anthropologists take another look

A new study uses the training data you upload to sites like Strava to estimate the "critical speed" that determines your race performance

'Working Woman's Trans BC Enduro' follows two cyclists as they prepare for a six-day mountain-bike race in the Kootenay Range

A professional climber dishes her secret sauce to mastering this dicey move

With the right approach, you can come out of summer running stronger and fitter 

To figure out how your body will respond in hot conditions, consider your “physiological equivalent temperature”

You can do more with this simple training tool than you think

The cycling world has turned its eye toward an obscure challenge called Everesting

Maybe the debilitating effects of chronic overtraining syndrome are in your muscles after all, not your head or your hormones

How Colorado-based mountaineer Erin Parisi is preparing to bag all seven peaks

To perform the ultimate lower-body move, you need to follow this progression

Miss your go-to barre studio or lifting weights at the gym? Bring some structure into your living-room workouts with these videos that are �����ԹϺ��� tested and approved.

Physiologists from around the world share their pet theories and crazy ideas on what it will take to break records

A new study of female athletes sees big strength gains from twice-a-week lifting

Most endurance events are canceled for the summer, but Spartan Race will hold its first event since the pandemic from June 13 to 14 in Florida

Researchers put the four main running power devices through a series of tests and picked a clear winner

Inversions might seem intimidating at first, but the handstand pose is an attainable goal for any active person with the right mindset

How Sarah Herron found herself in the mountains, then helped others do the same

The Leadville 100 is an iconic mountain-bike event that puts racers through a course covering 100 miles and 12,000 feet of elevation change

Beth Rodden opens up about her decades-long struggle with her body and climbing

Anna Levesque uses yoga to slow down and fight self-doubt

New research explores why you go slower and feel worse, even though you’re pushing as hard as usual

Wouldn't it be great if there was a technique that would allow us to vanquish fear and beat back stress? 

New research on mental fatigue suggests that even elite runners perform worse after a 45-minute computer task

Last week a paper suggested that runners and cyclists need much more than six feet. The report went viral, and backlash ensued. But there was some legitimate science behind the claims.

Build strength, train cardio, and break a sweat at home with minimal equipment

New research suggests that the lactate produced by hard interval workouts alters the hormones that determine your appetite

So-called "flush drownings" lack an obvious cause like getting trapped underwater. Researchers now believe water temperature is a key factor.

Simple steps every runner can take to keep things fresh, build momentum, and reach goals.

Sean MacCormac says the keys to his success are ballet and breathing through the panic

Tricks to making your home workout as easy—and productive—as possible

8 minimalist strength exercises from alpinist Anna Pfaff, for when you're waiting out the weather—or a pandemic

Build explosive power with this simple routine from professional athlete Braydon Bringhurst

Train like a pro with these safe and simple hang-board workouts

Develop explosive power and speed by training muscles to produce maximum force in the shortest possible time with these plyometric exercises