It's the first time she's run the Boston Marathon since 1976 and her first marathon since 2011, but she's raced in 39 marathons throughout her lifetime and has a new prize waiting for her at the finish line this year. Since then, I've gone on to run an 11 additional marathons - though my consideration process has become a bit more tactful. Switzer formed 261 Fearless, a nonprofit running club for women that has groups across the country.
Gibb became the first woman to run the marathon in 1966, at the time when organizers believed females to be too frail for the grueling 42.195 kilometers (26 miles 385 yards) course. In the women's wheelchair race, Switzerland's Manuela Schar was first across the Boylston Street finish line in 1 hour, 28 minutes and 16 seconds. Outraged that a woman had registered for his race, he chased Switzer down, yelled at her, and tried to rip her bib numbers off.
But in case anything did happen, he carried a phone with him as he ran the course this year-a first for the experienced marathoner.
She's won in London, New York City and Los Angeles. Desi Linden, who was second in Boston by 2 seconds in 2011, finished fourth - the first time since 1991 that two USA women have finished in the top four.
May the roads rise to meet them and their races be easy. And Kathrine Switzer, wearing the same bib number - 261 - that she wore when she entered the all-male race 50 years ago, using only her initials, K.V. She's joined in the field by countrywoman Buzunesh Deba, the 2014 champion.
With two-time fourth-place finisher Shalane Flanagan out with a back injury, the US hopes on the women's side are represented by Desi Linden, a two-time Olympian who has thrice placed in the top 10 in Boston.
The second two groups will be the men's and women's push rim wheelchair, which will begin at 9:17 and 9:19, respectively, followed by Handcycles at 9:22, and the Elite Women's group at 9:32.
The actual start of the marathon is 8:50 a.m., when mobility impaired competitors will lead off the marathon.
Marathon bombing survivor Marc Fucarile participated in the handcycle division, finishing with an unofficial time of 2:06:37. The Elite Men and first wave of runners will kick off at 10:00, with the next three waves setting out in 25 minute increments.
Runners who are blind, wear prostheses or have other challenges set off from Hopkinton, Massachusetts, on Monday morning.
Security has been extra tight since 2013, when bombs killed three spectators and wounded more than 260 others.