Bill Hayes’s new book, ‘Sweat: A History of Exercise,’ offers a personal account of a universal tradition

Your unexplained fatigue may be due to calorie deficiency, with serious implications for your health and performance

An analysis of pro cycling data finds that altitude-born South American riders race better at high altitudes than their lowland-born rivals

The oral health risks associated with heavy sports-drink use seem clear, but the evidence remains murky

Eating right looks different for athletes, and following vague nutrition maxims can have a surprisingly negative impact

New findings suggest that results from large training studies can’t be generalized to individuals

Follow our 12-week, effort-based plans to achieve your half-marathon goals and have a great race experience

A new study of identical twins shows that, despite their reputation as inert rubber bands, Achilles tendons adapt to exercise

Most studies on sports performance don’t include women. The team behind Stanford’s FASTR program is creating a new approach—and building a healthier culture for female athletes. 

New research explores how physical and mental factors affect how athletes raise their game when it counts

A popular training rule for endurance athletes faces scrutiny from skeptical scientists

A new study grapples with a familiar question: How much of athletic success is physical, and how much is mental?

The company’s newest flagship timepiece promises astounding battery life as well as efficient solar charging, and it comes with a flashlight

We tend to assume that a nice-looking stride is a fast one, but maybe looking good is its own reward

A training plan and general principles to guide your first foray into longer ultramarathons

Starting at five hours a week, this ten-week program will help you build endurance and jump-start your training this winter

Four years ago, the Minnesota phenom won historic Olympic gold in cross-country skiing, alongside Kikkan Randall. She was just getting going.

Scientists have figured out how to make simple exoskeletons that improve running efficiency. Should track and field authorities be worried?

Different workout styles can get you equally fit, but they affect your body differently—which suggests that you should mix it up

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