She Became the First Woman to Run the Boston Marathon in 1967. Now, at Age 79, She Still Runs Up to 40 Miles a Week (Exclusive)

Kathrine Switzer made history by running, and she doesn’t plan to stop any time soon.

Switzer, the first woman to run the Boston Marathon in 1967, has dedicated her life to furthering access to women’s running and tells PEOPLE that, at age 79, she still runs “30 to 40 miles” a week.