With supreme effort and laserlike dedication, Bannister did just that. On May 6, 1954, he became the first man to break the four-minute mile barrier with a time of 3:59.4. It was a milestone so important that Sports Illustrated rated it, along with the climbing of Mount Everest, as the most significant athletic feat of the 20th century.
Realizing that he must be in top shape mentally as well as physically, Bannister psyched himself up from the beginning. He vowed never to allow "passing disappointments at a later stage" from stopping him. In addition, he wouldn't let his training interfere with his studies. "I must be the international athlete who trained least," he said in an interview with the Academy of Achievement.
Bannister compensated by training smart. He trusted his own instincts rather than listen to coaches who ordered him to run or exercise a certain way and wouldn't provide the intellectually curious Bannister with explanations as to why.
"Running thrives in an atmosphere of interplay of ideas about training. I have always learned more from other athletes than from professional coaches," Banniser wrote.
http://www.nvtrackstats.com/roger_bannister.htm