Bret Runner has made an important point.
You really don't have to go far up the ultra running hierarchy to find a hero.
Any man or woman who takes on a target much bigger than anything they have done previously, and overcomes the odds, has displayed an element of heroism. Taking on a race where you are likely to fail is a bit like looking into the abyss.
I have gained a strong respect for female ultra runners who take on the 100 mile events. It is terrifying to take on an event where you have a 50/50 chance of getting eliminated on paper, but some of these events see the female field reduced to a single lone warrior.
That is a hero for you right there!