"The 'Firsts' series casts a spotlight on those moments in sports history that rewrote perceptions. Behind records, events, and personalities there are often stories that have never been told in detail. Join us now as we step into a time machine and savor them." More than 70 years ago, running a mile in under four minutes was widely regarded by the medical and scientific communities as an insurmountable physiological limit; many experts confidently claimed that if someone ran at that speed the athlete would drop dead on the track. The closest anyone had come was in 1945, when Swede Gunder Hägg raised the mile world record to 4:01.40. That time became an invisible wall—nobody could advance it for nine full years. Interestingly, 25-year-old medical student Roger Gilbert Bannister never believed the record was unattainable. After finishing fourth in the 1500m at the 1952 Helsinki Olympics, he decided to attempt to break it. Bannister trained an hour a day, and a year later had improved to 4:03.60. On the morning of May 6, 1954, at an annual British amateur inter-club match, Bannister enlisted two teammates as pacemakers. After the start, Bannister ran the first lap in 58 seconds, reached the half-mile in 1:58.30, and finished the third lap in 3:01. The two pacemakers had led through the first three laps, and Bannister needed to cover the final 400 meters in under 59 seconds to have a chance at breaking four minutes. He took the lead at about 350 yards, equaled the then-1500m world record at the 1500m mark, and after crossing the finish line an exhausted Bannister collapsed into the crowd. When the chief timekeeper handed the result slip to the announcer and began to announce "three minutes..."—before he could finish the time—the broadcast was drowned out by the roar of nearly 3,000 spectators. Although that record stood for only 46 days—until Australian John Michael Landy broke it with 3:57.90 in Turku, Finland—Bannister's achievement acted like a key, opening a new chapter in humanity's pursuit of limits. Today, more than 955 runners worldwide have achieved this, and the men's mile world record was pushed to 3:43.13 in 1999 by Hicham El Guerrouj. Now that spirit of "breaking the impossible" will be carried forward by Britain's middle- and long-distance star Josh Kerr. This Saturday, in front of a London crowd, he will attempt to chase that target record—aiming to redefine the 27-year-old mile world record by setting it under 222 seconds (3:42), continuing the legacy. #one-mile record #world record #Josh Kerr #Hicham El Guerrouj #trail running boom