I recently purchased the 100 mile plan and have dropped it into my calendar to begin 12/18.  I've noticed that it's all HR zones for the training runs and I don't see any speed zones.  I also noticed that the performance test is different from The Cool Impossible.  The book has us do a 1 mile test and a 20 minute test to set HR and speed zones.

Is there a particular reason/theory to not use the speed zones in the 100 mile plan?  I found that the set HR/Speed zone runs in The Cool Impossible were not only fun but where I improved the most.



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