Trail Runner All Uncategorized Uncategorized Why Athletes Should Consider Blood & DNA Marker Testing January 5, 2021 zoe hrom Share this Facebook Icon Twitter Icon Email Icon Join Trail Runner Magazine Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Join Trail Runner Magazine Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Get access to everything we publish when you sign up for Outside+.