ironman

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.(by extension) The winner of such a lifesaving event or triathlon.