Triathlon (triathlon, in the Portuguese version) is an endurance sport made up of three activities in sequence, without breaks: swimming, cycling and running.

The first news of competitions involving these three modalities together comes from the 20s of the last century in France. There are reports of a competition in Joinville-le-Pont in 1921 and other disputes throughout that decade such as the "Course des Trois Sports" in Marseille and "La Course des Débrouillards" in Poissy. At the time, there was a slow and regional progression of this new type of competition with reports of the "Les Trois Sports" competition held in La Rochelle in 1934.

A historic milestone for the worldwide dissemination of the sport dates back to September 25, 1974 in San Diego, California (USA), two members of the San Diego Track Club, Jack Johnstone and Don Shanahanem, created the Mission Bay Triathlon. Among the participants There were Judy Collins and John Collins, who four years later would create Ironman Hawaii on the island of Oahu, an event that boosted the spread of the sport around the world.

Since then, the most famous triathlon race in the world has been held annually on the island of Kona.

The first competition in Brazil was held in the city of Rio de Janeiro, on May 13, 1983, the “Triathlon Café do Brasil”. The creation of the International Triathlon Union in 1989 and the inclusion of the sport in the Sydney Olympic Games in 2000 established the sport and boosted the popularization of the sport around the world.