Tomorrow marks the 128th running of the prestigious and historic Boston Marathon, but it wasn’t until 1972 — 75 years after the inaugural race — that women were officially allowed to enter. Women were “not physiologically able to run a marathon,” after all. *eye roll*

Thankfully, two brave women bucked those rules. In 1966, Roberta “Bobbi” Gibb became the first woman to (unofficially) complete the course.  Gibb arrived at the start line undercover, donning her brother’s Bermuda shorts, and hid in the bushes before joining in after the men had already taken off. She finished in a speedy 3:21:40, ahead of two-thirds of the male competitors.

Gibb’s run paved the way for the aforementioned Switzer, who was the first woman to run as a registered competitor, albeit under the non-gendered name Kathrine Switzer. Though race manager Jock Semple infamously accosted Switzer during the race, she prevailed, finishing in 4:20 and going on to dedicate herself to helping female athletes who had been denied opportunities for far too long.