Bob (the soon to be king) was walking through the meadow when he came upon a magical door. He felt the urge to see what was inside, so he opened the door and walked in.
He came upon Zeus, the ruler over all the gods, and of the weather. Zeus told Bob that if he was going to be king over the land then he would need to prove himself worthy. Bob agreed and was sent on his way to his first challenge.
To prove his skills as a nobel warrior and a mighty leader Bob would have to compete in a warrior's race.