"Four kilometers already!" shouted the voice. "Stop now, fool! You won't make it another step!""No, I can do one more," I replied, as if defying a capricious god. "I must reach the goal."My legs, a stubborn machinery of bone and muscle, kept moving, though slower now, as if each step were a challenge to time itself. It was no longer a movement of will but a feverish hunger to push further, into the territory of five kilometers.