Boys and girls run together!

For the first time in IAAF World Relay history, there was a mixed shuttle hurdle relay at the 2019 event in Yokohama, Japan. This co-ed relay involves two women running the 100M hurdles and then sprinting 10M, while the men run their full 110M hurdle race.  Though only three teams participated and one got disqualified, team U.S.A. showed up and showed off.