In the sport of athletics, the four-minute mile is the act of completing the mile run (1,760 yards, or 1,609.344 metres) in less than four minutes. It was first achieved in 1954 by Roger Bannister in 3:59.4. The “four minute barrier” has since been broken by many male athletes, and is now the standard of all male professional middle distance runners. In the last 50 years the mile record has been lowered by almost 17 seconds. Running a mile in four minutes translates to a speed of 15 miles per hour (24.14 km/h, or 2:29.13 per kilometer, or 14.91 seconds per 100 meters).