Gigathlon is an adventure endurance sport that includes open water swimming, running, cycling, biking and inline skating. The competition lasts 7 days and all the sports are performed every day. There are some athletes that are doing the entire gigathlon solo and there are also teams and duos at the start.
Approximately 10,000 athletes took part in the first Swiss gigathlon in 2002. This race was 1477 km (918 miles) in length, and took seven days. The disciplines were open water swimming, mountain biking, cycling, inline skating/wheelchair and running, and most entrants competed as part of a team. Of the 163 people who attempted the entire race as individuals in the first race, 65 made it to the finishing line. Gigathlons have been growing in popularity ever since.