I have had very good success with a free web site called Halhigdon.com. This is a person that is an authority in runnin many distances and has held US records for certain age groups. His site will allow you to download training plans for various distances 5 k - marathons as well as to pick out a plan for a beginner, intermediate or advanced. I like his plans as they allow the runner to have hard days followed by easy days, track days and hill days and usually one day off for rest. I have rarely found a person that follows his training plan to be hurt. Some plans are so "advanced" that the runner can not get to the starting line without an injury. Most of his plans require 10 - 18 weeks of training.
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To prepare, you have to train for a few month's, or a long time. Always, always, always, stretch first before you run. To train, start your training with short distances, then as you progress, you can start running longer distances, then you will be able to run a 5K easily.