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

In order to achieve his first UTMB win, the American ultrarunning star is taking a whole new approach: rest

It is believed to be the first death in the 19-year history of the Ultra-Trail du Mont-Blanc races in and around Chamonix

The popular app promises weight loss without dieting. Then it proposes restrictive eating habits.

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

Running nerds won’t learn anything new from ‘Kipchoge: The Last Milestone,’ but it’s still a feast for the eyes

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

The Tokyo Games reminded us why athletics remains the greatest show on earth

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

No runner has ever won the 5,000-meter, 1,500-meter, and 10,000-meter treble at the same Olympics. But there have been other memorable distance triples and doubles.

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.

We asked a handful of athletes competing in Tokyo in various sports to share how they fuel themselves

In what might be the first step toward an unprecedented triple, the Dutch runner won two races on the same day

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

Despite IOC malfeasance and the ongoing pandemic, the five-ring spectacle is too seductive to ignore

After losing his father to cancer, a mule deer researcher embarks on a healing migration of his own

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.

What this Olympic moment can teach all of us about mental health

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

The nutrition trend is all over TikTok, and it’s actually not a bad idea

After discovering Skinnies Sungel, our writer no longer dreads lathering up for a day outside

Sponsor Content: Saucony

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?

Sponsor Content: Eukanuba

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

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

Starting in 2022, the world-famous ultramarathon will implement a new entrance scheme that aims to bring more women into the race

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

What we learn from getting way, way outside our comfort zones

From cereal and waffles to cottage cheese, we found retooled takes on the morning classics

New research fine-tunes the details of heat adaptation

Pandemic-induced isolation has led to a wide range of physical effects. Here’s what to watch out for—and how to address it. 

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

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