The impact divers David Boudia and Katrina Young have on their sports is undeniable, but the groundbreaking skills they perform can take a toll on their bodies. Susie Parker-Simmons, a physiologist with the U.S. Olympic and Paralympic Committee, explains how an athlete's growth is monitored to avoid injury. “Changing the Games” is a 10-part video series produced in collaboration with Lyda Hill Philanthropies.