It’s pretty silly now to think back and imagine those who said it was physically impossible to break 4-minutes in the mile. The world-record has gone from: John Paul Jones (U.S.), 4:14.4 in 1913 to Hicham El Guerrouj (Morocco), 3:43.13 in 1999.
Now the great barrier and debate of our time is the sub-2-hour marathon (4:34 per mile)! Seems ridiculous, right? According to Jack’s calculator the equivalent performance for the almost untouchable 3:43 mile record in the marathon is 2:03:21. Let’s look at the progression of the world-record in the marathon: Johnny Hayes (U.S.), 2:55 in 1908 to Patrick Makau (Kenya), 2:03:38 in 2011 (4:43 per mile).