Kathrine Switzer was a 20-year-old college student when she registered to run the 1967 Boston Marathon, her first marathon. Early in the race, assistant race director Jock Semple charged onto the course and tried to physically rip off her bib number and remove her from the competition. Kathrine’s boyfriend pushed him out of the way and despite taunts from media to quit because she was female, Switzer kept running. She finished the race, becoming the first woman to officially register and run in the Boston Marathon, a groundbreaking moment in American history, and has been blazing trails for women's running ever since.