In triathlons, participants must complete three events: swimming, cycling, and running. These events test an athlete's endurance, speed, and versatility, as they transition from one discipline to another. The sequence typically begins with swimming, followed by a cycling leg, and concludes with a running segment. Triathlons can vary in distances, such as Sprint, Olympic, and Ironman formats, catering to different skill levels. Athletes prepare extensively for each segment to ensure optimal performance throughout the event.