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Also, I am in Texas, and heat increases HR pretty substantially.

@rbrbrb2 I did a half Ironman with a training plan based on heart rate zones. I started from the couch, so my zone 2 was just walking for a while. As I became more fit I was able to speed walk in zone 2 and then run :) The book I was using said the same thing - stick in the heart rate zone you...