Roger Bannister breaks the four-minute mile world record.

Roger Bannister achieved sports immortality by being the first person to run a mile in under four minutes, clocking in at three minutes, 59.4 seconds. Despite pushing himself to the limits of physical endurance, Bannister remained modest about his groundbreaking accomplishment.

What is the significance of Roger Bannister's achievement in sports history?

What limits did Bannister push himself to in his running?