Triathlete (noun)

A person who competes in triathlons, which are endurance races consisting of swimming, cycling, and running.

Origin:

Late 20th century: from tri- + -athlete, on the pattern of biathlete.

Examples:

1. The triathlete trained tirelessly to improve his times and push himself to the limit.
2. The triathlete was a true embodiment of fitness and determination, inspiring others with his passion for the sport.
3. The triathlete was well-rounded, excelling in each of the three disciplines of the race.
4. The triathlete was a veteran of numerous races, and was respected and admired by his peers.
5. The triathlete was a fierce competitor, driven by a desire to win and be the best.