When physically demanding activities are performed at high altitudes or in other low-oxygen environments, excellent coordination, judgment, and decision-making are important. In some cases, such as ...

Cardio fitness shows heart-lung strength, predicts longevity, and improves health at any age.

Smartwatches can measure everything from heart rate to sleep quality, but one health metric has become particularly relevant over the past two years: blood oxygen saturation. Two of the world's ...