Training & Performance

Julian Smith
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.

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

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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

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

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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?

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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

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

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

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