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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?

On an expedition to track lemurs in Madagascar, wildlife ecologist Rae Wynn-Grant found her confidence and her voice

Through the moving story of a widowed astrobiologist and his unusual son, ‘Bewilderment’ addresses our apathy in the face of environmental disaster

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

Intrepid author Mary Roach shares tales of thieving bears, murderous possums, and mugging monkeys from her new book, ‘Fuzz’

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

When you confront your mortality on a regular basis, the shift in perspective can be profound

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.

A new app called NatureQuant harnesses the latest research to track and rate your time outside. Next up: determining how much you need.

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

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

Get these six items to improve your sleep and wake up ready for anything

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

If it seems like you’ve been hearing about lakes and beaches closing down more often, you’re right. Various types of toxic algae are multiplying like crazy in bodies of water across the country, and stopping them won’t be easy.

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

Lyme-carrying ticks are a bigger threat than ever. A promising new antibody treatment looks to stop infection—even after a tick bite.

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

As a college student, writer Julia Rosen spent a summer on Alaska’s Taku Glacier, which kept growing for decades in spite of warming temperatures. Now, she reckons with its uncertain fate.

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

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

Exercise may not be enough to make up for thru-hikers’ bad diets, a new paper suggests

New research fine-tunes the details of heat adaptation

The buzziest supplement on the market might just live up to the hype. Here are our favorite new products.

The nonprofit Native Skywatchers has spent more than a decade collecting and preserving Indigenous star knowledge. Now organizations like NASA and the NPS are joining the movement.

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

Quick fixes and one-size-fits-all solutions abound in the world of wellness influencers. Here’s why you should avoid them.

We may be closer to answering lingering questions around concussions. Plus, we provide a rundown of the most common head injuries—and what you need to know about them.

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

The later moon missions didn’t grab as much attention as the first landing in 1969, but they had something very cool on the gear front: the lunar rover, a lightweight go-kart that gave crews unmatched mobility on another world

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