Day 4 highlights at the #trackfieldtrials21 . : : © 2021, Paul Merca for @tracktownusa . All worldwide rights reserved. : : #nikond750 #nikond850 #nikonsports #nikonsportsphotography #nikonsportsphotographer #paulmerca @newbalancerunning @nikerunning @usatf @worldathletics #journeytogold #roadtotokyo2020ne @pumarunning