Editor’s Note: Click on the words highlighted in this story to pull up a definition and short research summary. Visited recently by one of his former students, Minnesota teacher Eric Kalenze was ...

Becoming a better, stronger runner isn’t just about upping your mileage. In fact, logging too many miles can be counterproductive. A more strategic approach is to dial in your efforts—and that’s where ...

Stamina is the resilience that keeps you going—physically, mentally, and emotionally. It’s your ability to sustain effort over time, whether you're powering through a tough workout, juggling ...