Of course...track is a global sport. At the DI level you likely had teammates from different regions of the country or different nations.
You could say something along the lines of..."my time as an athlete at XXX University provided me the opportunity to train with athletes from YYY, and I encountered different cultures, value sets and viewpoints. This experience showed me first hand the benefits diversity can bring to a team/program."
I am sorry if your team was homogeneous, or built solely with local athletes. But, even then you can spin it as "I competed against and encountered diverse groups and..."