<p>
I don’t have much experience with running, but a 4:23 mile on little training is definitely possible. From: [LEARN</a> THE 15 LAWS OF TRAINING](<a href=“http://www.coachr.org/learn_the_15_laws_of_training.htm]LEARN”>http://www.coachr.org/learn_the_15_laws_of_training.htm)</p>
<p>“who ever records that exceptional runners like Walter George and AU Shrubb achieved quite remarkable performances on very low mileage? George ran a mile in 4:10.6 and a 16-km run in 49:29 on little more than 3 km of training per day.”</p>