A new study quantifies the effects of running on technical terrain

A new study uses machine learning to quantify the effects of temperature, humidity, heat, and sun

Scientists take their equations for the energy demand of hills and rough terrain out into the real world

The link between serious cycling and poor bone health is well established, but researchers are still debating what to do about it

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Sound impossible? Runner Jordan Tropf has put in the work—here’s how he pulled it off.

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

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