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Stuart i'm reading the book ...
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I'm reading the book "Finding Ultra", and I just read that you should try to do as many miles in Zone 2 with respect to heart rate (for the author, that was below 140 bpm). Evidently, all of my training is in the "gray zone--a dreaded no-man's land where the effort exerted exceeds that which is requried to properly develop the aerobic engine, yet falls short of the intensity necessary to significantly improve speed or increase anaerobic threshold." The grey zone is my bread and butter! (145-150 bpm). Oh lovely, so this is why I haven't made any significant gains in the past year. I need to SLOW DOWN!?