Just swimming, cycling, and running back to back for people who decided one sport wasn't quite enough punishment.
Fun fact: The Ironman was born from a 1978 bar debate in Hawaii over which athletes were the fittest.
Valve just left it running like a pub with no landlord and somehow it's still packed every night.
Fun fact: Valve hired economist Yanis Varoufakis to study its hat economy; he later became Greece's finance minister.