The half marathon training plan is designed to take are runner with some running base (12+miles/week). This plan prepares you by steadily increasing distance and intensity as the plan progresses but with built in recovery to ensure that you continue to make gains without running the risk of over training.
With this training plan you will quickly see the importance of a structured training plan and how intervals can improve the effectiveness of your training time.
It is important to complete the Field Test for this to improve the efficiency of your training. The field test will create training ranges (Pace and/or HR) for your runs to allow for improved results