In 1954, Roger Bannister broke the world record and ran the mile in under 4 minutes. In the whole of the history of the human species, no-one had been able to do that. It had been considered impossible - beyond the physical limits of the human body. Year after year, runners had come closer and closer but no-one was able to break the 4-minute barrier.

    Not only did Bannister practice and train, he constantly rehearsed the event in his mind until he truly believed that he could do it. Even though nobody before had been able.

    Yet, within six weeks of Bannister breaking this psychological barrier, it was broken again, and within a few years the mile had been run in under 4 mnutes hundreds of times!