Kathrine Switzer wasn’t going to be stopped. As the daughter of a major in the United States, failure was never an option. While studying at Syracuse University, a coach once told her that a “fragile woman” could never run in the Boston Marathon. This only encouraged her further. Undeterred, she trained in secret and entered the race in 1967.

Rather than simply letting her run, officials reacted negatively and even tried to pull her from the race. Fortunately, Kathrine Switzer was running alongside her boyfriend, who helped fend off those around her. She finished the competition in just over four hours.