when people think about heart health, they picture numbers like blood pressure, cholesterol, or maybe their resting heart rate. But there’s another number—one that’s less talked about but arguably just as important: heart rate variability, or HRV.

Leading experts have been revisiting their views on extreme fasting, and their research suggests there’s a smarter, more sustainable way to

Creatine monohydrate remains one of the most extensively researched supplements in exercise science. Advocated by multiple experts,...