She added that the Boston Marathon in particular was a special event."Boston's a great race because the city just embraces all the runners; the atmosphere on the course and all the volunteers are incredible", she said.Julia Miller and Jackie Loween, both of Alexandria, Minnesota, are two friends who trained for the marathon together, each with their own special cause behind them. When she was discovered, after the marathon had already started, the race director tried to rip her bib numbers off her back.
American Jordan Hasay, making her first run at the 26.2-mile distance, was third and Desi Linden was fourth - the first time since 1991 that two US women have finished in the top four.
On Monday, aged 70, she ran it again, finishing just under 25 minutes slower in 4:44:31. Back then, she concealed her name in an effort to pass as a man on the application and had a race official attempt to force her from the course a few miles in.
Fifty years ago, a runner officially entered as K.V. Switzer participated in the Boston Marathon. Included in those were members of the 261 Fearless Boston Marathon Team, an organisation Switzer founded after racing in 1967 to empower women in athletics.
This time, she was far from the only woman. Rupp, the Olympic bronze medalist in the event, finished second in his first big-city American marathon in 2:09:58 and Suguru Osako of Japan was third in 2:10:28.
Switzer told WBZ-TV that 125 people ran with her to raise money for the foundation.
Switzer wore the familiar bib No. 261 on Monday, the same number she wore in 1967. "And it's awesome to see American distance running on the upswing and being competitive in these races".
"I didn't plan to do anything but try to cover 26 miles, 385 yards", Switzer said.
"I just felt that I had to run the Boston Marathon".
"When I finished, they were bringing cameras and microphones and things to do a big interview with out", Tews said.
Switzer's run became one of the feel-good stories of the marathon, with celebrities like George Takei, Dan Rather and former WWE wrestlers The Bella Twins praising her tenacity.
Who would have imagined, 50 years later and still toeing the line! "I want to celebrate in the best possible way and crossing that finish line is going to be a wonderful experience".
Others have even more motivation that they run for, like Katie Rose from Concord, North Carolina.