We report a 57-year-old man who developed subacute small bowel obstruction after running a marathon. A fibrofatty band was identified restricting the terminal ileum upon subsequent imaging. Surgical division of the band resulted in complete resolution of the patient's symptoms. Fibrofatty bands are embryonic remnants of the vitellointestinal duct and have not previously been reported to cause small bowel obstruction at the terminal ileum. We discuss the origin of remnant fibrofatty bands and physiological impact of running a marathon upon the gastrointestinal tract that would have contributed to development of subacute small bowel obstruction.