Till 1953, many experts thought that running a mile in four minutes was physically impossible. So, no athlete ever tried to run that fast. But Britain’s roger Bannister had internal conditioning that kept him from tripping over the so called evidence. He was determined to see for himself. In 1954, with a time of 3.59 minute. Bannister broke more than a world record. He broke the mind sets conditioned with self limiting attitudes. Now athletes record sub four minute miles regularly.