Trail Runner Nation is devoted to sharing knowledge and advice to the trail running community - from beginners to the pros! We offer tips and discussion regarding race nutrition, pacing strategy, mental focus and much more from well-respected members of the trail community.

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Biomarkers help us understand what is going on inside our bodies.  There are many that are very important to endurance athletes.  In this episode  helps us identify five of these biomarkers, why they are important, what is the normal range...