One runner spent $40,000, another took a second job. Marathoners are making big sacrifices to chase medals worldwide.

David Boyce, who takes runcations, competing in the London Marathon in 2024. Courtesy of David Boyce When some people travel, they collect fridge magnets or shot glasses. Eugen Godun collects marathon medals. Last March, the 34-year-old software developer earned the coveted Six Star medal for running the Boston, Chicago, New York City, London, Berlin, and Tokyo marathons, known as the original World Marathon Majors. When Godun crossed the finish line in Japan, he burst into tears, overcome by…