At the 1968 Mexico City Marathon, a male runner knocked against another runner a short distance after the starting point and fell. His legs were bleeding and he had difficulty continuing the race. The paramedics advised him to stop the race but he wanted to continue. The other runners were already almost out of view.
The sky turned dark but he was still running with the bandage, perspiring, and bleeding. He reached the finishing line after a very long time. Everyone was saying he was the last anyway and there was no need to continue running.
Obviously, that wasn't what he thought.
"My country did not send me 5,000 miles to start the race. They sent me 5,000 miles to finish the race." -- John Steven Aquari of Tanzania
If you are interested, watch a snippet of it here.
Not everyone has that strong mental power.