Until this past weekend, no transgender male athlete had ever competed in an Olympic trial alongside other men. That all changed on Saturday, Jan. 25, in Santee, Calif., when six-time member of Team USA, the All-American duathlete and Hall of Fame triathlete, Chris Mosier, stepped off the starting line in the U.S. Olympic Team Trials Men’s 50km Race Walk.

Mosier made history, as the first trans man to compete in the men’s Olympic trials.

He shared pictures of the race with his 19K followers on Instagram, declaring, “What an incredible experience!” One of his photos from the finish line showed out competitor Matthew Forgues, Saturday’s second-place finisher, standing with a Pride flag next to his husband, Manuel Martinez. Read more via OutSports