Sub 3hr Marathon Plan - ' I achieved a sub 3hr Marathon (2:50:28) running with this program' Biggest mistake people make training for a PB is that they train for a time too close to the line. If you are going for Sub 3 - you need to be trained for 2:57 to give you a few minutes for small things on the day which might not go your way and hinder the chance to achieve the PB. Hope this plan brings you all the same joy it brought me, All the best Coach Marc!