For years, experts said it couldn't be done. Doctors believed the human body wasn't capable of running a mile in under four minutes. Coaches said it was impossible. Athletes chased it and failed. The world accepted the limitation. Then on May 6, 1954, Roger Bannister ran a mile in 3 minutes, 59.4 seconds. The impossible happened. But here's the part nobody talks about. Once Bannister broke the barrier, others started doing it too. Within weeks. Today, thousands of runners hav