In 2020, when amputee ultra runner Jacky Hunt-Broersma saw that Alyssa Amos Clark had broken the record for running 95 marathons in as many days, she thought to herself, “Well, that would be interesting to try and do. Especially running on a prosthetic leg …”

Two years later, in late April, 46-year-old Hunt-Broersma broke the record, which could take up to a year for Guinness World Records to ratify, with 104 marathons in 104 days, including the Boston Marathon’s para-athletic race (which was Day 92).

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