training for half marathon after completing The Cool Impossible program

I am in the 2nd week of phase 2 of the cool impossible.  So far things are going pretty good.  I am looking to do a half marathon this fall/ winter, but because of family, schedules, etc the one I found is about 4 weeks after I am scheduled to end the cool impossible run foundation program.   If I repeated the last 4 weeks of phase 2, would that be the best way to train for this?  Should I keep the heart rate training zones concentrated on the half marathon training zone?




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The Cool Impossible by Eric Orton

The Cool Impossible: Run Beyond Limits

“this is by far one of the best training books of the past decade.” - Competitor Magazine

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