Jul 16, 2019 David dropped 24.2 seconds in a year! View this post on Instagram David started training for the 400m one year ago. His first time trial was an 82. One year later his new personal best is a 57.8. Nice work dropping 24.2 seconds in a year! #mondaymotivation #hardwork #dedication #sprinting #400m #track #rateofforcedevelopment #strengthtraining #goals #improvement #lifestylechanges #eatsleepsprintlift #resultsdriven #performancetrainingsystems A post shared by Performance Training Systems (@ptschicago) on Sep 17, 2018 at 4:45am PDT
