Endurance athletes put our bodies and minds through all kinds of torture, but do we really know why we’re doing that 6:00 a.m. track session? There should be a good reason behind every workout we do, and a good coach or plan helps make every workout worth it.

Muscle oxygen consumption assessments through near-infrared spectroscopy is a new technique for assessing an athlete’s optimal training zones, limiters, and race paces. Explore how we do that here!