There are many things that classify an athlete as a triathlete. Mainly, an athlete is classified as a triathlete if he or she successfully completes a triathlon event.
Athlete
The prefix of "triathlete" is "tri-" meaning three, and the suffix is "-athlete," indicating a person who participates in sports or physical activities.
The triathlete was exhausted by the time the competition was completed. A triathlete typically competes in running, swimming, and cycling.
Chris McCormack - triathlete - was born in 1973.
Wang Dan - triathlete - was born in 1980.
Richard Stannard - triathlete - was born in 1974.
Peter Robertson - triathlete - was born in 1976.
Mark Allen - triathlete - was born in 1958.
Will Clarke - triathlete - was born on 1985-01-31.
Mikhail Shubin - triathlete - was born in 1988.
Emma Jackson - triathlete - was born in 1991.
Philip Graves - triathlete - was born in 1989.