As a young adventurer, Fossett was one of the first participants in the Worldloppet, a series of cross country ski marathons around the world. While he had little experience as a skier, he was in the first group of 'citizen athletes' to participate in the series debut in 1979. And in 1980, he became the eighth skier to complete all 10 of the long distance races, earning a Worldloppet medallion.