ironman
noun
Definitions
An extremely tough and strong athlete, especially one who competes in extreme athletic competitions or in a large number of games consecutively.
A form of surf lifesaving competition which combines swimming, board paddling, ski paddling and running.
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.
(by extension) The winner of such a lifesaving event or triathlon.