ironman

Etymology
From. First applied to, a baseball player who pitched 48 complete games in one season and worked in an iron foundry during the offseason.

Noun

 * 1) An extremely tough and strong athlete, especially one who competes in extreme athletic competitions or in a large number of games consecutively.
 * 2)  A form of surf lifesaving competition which combines swimming, board paddling, ski paddling and running.
 * 3) An extreme form of triathlon, expecially one organised by the World Triathlon Corporation that comprises a 2.4-mile swim, a 112-mile bike race and a marathon run.
 * 4)  The winner of such a lifesaving event or triathlon.
 * 1)  The winner of such a lifesaving event or triathlon.
 * 1)  The winner of such a lifesaving event or triathlon.

Usage notes
The plural pertains to the athlete;  pertains to the event.

Translations

 * German: