A triathlon is a multi-sport race that consists of three continuous and sequential endurance events: swimming, cycling, and running. Participants complete these disciplines in a specific order, typically starting with swimming, followed by cycling, and finishing with running. Distances can vary, with popular formats including the Sprint, Olympic, Half Ironman, and Ironman. Triathlons can be completed individually or as part of a relay team, where each member competes in one of the three segments. The sport emphasizes both physical fitness and mental endurance, making it a popular choice for athletes looking to challenge themselves across different activities.