ironman

Short definition from Wiktionary

Noun

1. 1
   An extremely tough and strong athlete, especially one who competes in extreme athletic competitions or in a large number of games consecutively.
2. 2
   A form of surf lifesaving competition which combines swimming, board paddling, ski paddling and running.
3. 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. 4
   The winner of such a lifesaving event or triathlon.