If you are starting out in training, so I've heard, the best method is to use time running versus measuring a distance and trying to run that distance faster each following day, then adding distance once you reach a time goal (ex: a mile in 6-flat, then moving up to 2 miles [to be run in 12:00 ultimately], the 3 in 18:00 and so forth).
Can anyone provide some background/experience and examples of which of the two methods is most efficient?