To achieve that he said that he had to "discipline" his body. His mind was focused and he knew that his body would do whatever it was told. He told it to keep running. Though adversity increases, keep running. Don't stop and acknowledge the pain. Press on. Press through.
You will win the race when you take control of your body. Keep your eyes on the prize, your mind focused and run with all your heart in it. God is looking and waiting for you. YOU are a winner!