Once upon a time...
Once upon a time there was a knight named Sir Ironman that lived in leafy Tusmore. He ran and he swam and he rode all day, and then to relax he did it all again. And the next day he ran and he swam and he rode. And again the next day. And the next.
Sir Ironman trained and he trained. He trained by himself and he trained with his band of knights, The Lakers. He became obsessed with his quest to compete in the grand ironman tournament. He did this whilst holding down a tedious day job minding castles and keeping the scholars happy in their wisely pursuits.
Until one day Sir Ironman met (yet another) unsuspecting Maid Diversion, even though he was still gallivanting with his colleague, Lady Temptation, and had been for several years. Sir Ironman didn't see this as wrong and went on his merry way, doing exactly as he pleased. Running. Swimming. Riding. Gallivanting.
But poor Maid Diversion did not realise that Sir Ironman had committed himself to a gallant quest and could never commit himself to commitment. Even without the quest.
For he was a knight of Generation X and his dalliances were mere diversions from his busy schedule of running, swimming and riding. And gallivanting, of course. He never dallied more than a few months before he returned to his gallant quest and the charms of the fair Lady Temptation. Sometimes he didn't even wait that long.
Sir Ironman always thought he should do the right thing. But he could only stop himself from gallivanting with the fair Lady Temptation by misplacing her contact details so that he could not send messengers with pleading missives at all hours of the night.
Eventually, for reasons known only to himself, he always grew tired of his diversions and returned to the fair Lady Temptation. Again. And again. And again. And again. And again.
But never again. For even Lady Temptation has grown tired of his constant running and gallivanting, and swimming and gallivanting, and riding and gallivanting. With loyal knights of her own, she has no time for gallivanting ones. So she has locked her castle gates and withdrawn her drawbridge so that his messengers cannot cross.
Sir Ironman isn't much of a legend really.