Flanagan, who retired from professional running in 2019, set the lofty goal after saying “I have fallen back in love” with the sport.READ MORE: Nearly 15,400 Runners Crossed The 125th Boston Marathon Finish Line
She finished the Boston Marathon in a time of 2:40:34 just one day after completing the Chicago Marathon in a time of 2:46:39.READ MORE: Boston Marathon Returns To Patriots' Day In 2022
The Marblehead native has already completed marathons in Berlin and London in the last several weeks.
That leaves here with a virtual Tokyo marathon set for October 17, and the New York City Marathon on November 7, which would complete the feat.MORE NEWS: VIDEO: Highlights From 2021 Boston Marathon
Flanagan is a four-time Boston Marathon elite runner. In 2017, she became the first American woman to win the New York City Marathon since 1977.