A common phenomenon in endurance sports is that many runners spend too much time in the moderate intensity range, sometimes referred to as the “grey zone.” In this case, the workouts are neither light enough to promote recovery nor strenuous enough to stimulate significant adaptation. As a result, Training Intensity Distribution (TID) has become a central topic of discussion ...

Running economy is one of the most powerful, and often misunderstood, determinants of endurance performance. It describes the amount of oxygen your body requires to sustain a given running speed. It helps explain why some runners are consistently faster and fatigue later than others, even when traditional fitness markers appear similar. Two athletes may share the same VO₂ max...

Running builds strength, endurance, and resilience, but when does healthy training become too much? Every runner, from beginner to seasoned runner, eventually asks this question. The truth is that there isn’t a single answer. What’s “too much” depends on your background, age, recovery capacity, and training history. Yet, a major new study has shed light on when running volume...