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

Check out these titles for fans of science, endurance, fitness, and adventure

The company's library of studio exercise classes, integrated with on-screen fitness data from your Apple Watch, launches today. Our Sweat Science columnist takes it for a spin.

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

A new generation of futuristic at-home workout solutions—including Mirror, Tonal, and Peloton—were gaining steam even before the pandemic

Much more than fertility changes when menopause hits. Here's how to train through it.

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

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

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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

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

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

Sponsor Content: Under Armour

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

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

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

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

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