Kathrine Switzer was the first female to officially run the Boston marathon back in 1967, at that time considered a men’s-only race. However a race official tried to stop her mid-event when they discovered she was a woman. She went on to complete the course and she’s dedicated her life to enabling women to participate in the sport. Now in her late 70s, she’s run 42 marathons and is the co-founder of 261 Fearless, that aims to empower women through running.