Jacky Hunt-Broersma, 46, has run 26.2-miles every day since mid-January, normally taking around five hours.On Saturday, she completed her 104th consecutive marathon in 104 days.
Waking up on Sunday - a day off - was a bizarre experience for Jacky. "Part of me was really happy to be finished," she tells the BBC from her home in Arizona. "And the other part kept thinking I need to go running.
"Jacky - who was born and raised in South Africa, and has also lived in England and the Netherlands - is grateful. In 2002, doctors in the Netherlands diagnosed her with Ewing's sarcoma, a rare type of bone cancer. Doctors had to amputate her left leg to save her life. She was only 26 years old. "It was a rollercoaster," she recalls. "Everything happened so fast.
"For the first couple of years, Jacky struggled with the change in her life. She was angry that she had cancer and embarrassed to be different. Almost on a whim, she took up running in 2016.
After buying a special prosthetic for long-distance runners, she signed up for her very first 10K (6.2 mile) run and at the beginning of the year, Jacky gave herself a new goal: the record for the most consecutive marathons. Thanks to these runs, Jacky has raised over $88,000 (£70,000) for Amputee Blade Runners, a non-profit organisation.
(1 mile = 1,60934 km)