Muhammad Ali (former World Heavyweight Boxing champ), was such a person. At the age of 18, he won the light heavyweight Gold medal in the 1960 Rome Olympics. For most people this would be the peak of their athletic career – but not Muhammad Ali. He was not content with that. He recognized that he had the potential for further greatness. He worked really hard to further perfect his speed and agility in the ring. He ran and rope skipped extensively. He pushed himself to perfection. In fact, whenever he was so exhausted from running that he felt he could not take even one more step, he would always run an extra mile. That’s what gave him his tremendous stamina in the ring – mental as well as physical.
This is what it takes if you want to be great. You have to go that extra mile.