Learn the sagittal, frontal, and transverse planes of movement, their axes, exercise examples, and how to audit a workout.

In a “normal” electrocardiogram (ECG), the transition of the QRS axis in the precordial leads occurs between leads V 3 and V 4 (i.e., there is a dominant S in V 3 and a dominant R in V 4).

Becoming a stronger, more resilient runner isn’t just about the miles you log. Each exercise you do in your off-road workouts can help build a body that’s better able to handle those miles. One prime ...