Two new studies find performance benefits from high levels of the sunshine vitamin, but they're not the final word
A new study tries—and fails—to predict athletic greatness with a DNA test. Thank goodness.
Correctly timing all the elements of your taper can give you an extra edge on race day
Pronation is out of favor, comfort is too vague, but maybe measuring your "habitual motion path" will guide you to a shoe that minimizes your injury risk
Top trail runners mix running and walking on steep terrain, but even scientists aren't sure how we choose which is better
A creative, challenging at-home circuit to get you fit, no matter your sport
A leading company redefines what it's actually measuring, and explains why that's what we really wanted all along
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The company's library of studio exercise classes, integrated with on-screen fitness data from your Apple Watch, launches today. Our Sweat Science columnist takes it for a spin.
A new study explores the links between exercise and pain perception, and how easily they can be manipulated