P.S. Running at MAF feels real easy. Maffetone writes that it will feel easy, but some runners get so fast at MAF, that they end up having to use a lower HR than MAF for some training runs, because they find running at MAF uncomfortable. This is tied to his discussion of aerobic intervals in many of his books. I imagine he's talking about athletes like Mark Allen who ended up with 5:20 pace or better in MAF tests. I imagine it's relative though, and maybe my 5:20 would be a 7:20. I'll let you know if ever get there. It will be world news.

hahaha! I can't imagine a too hard pace at that HR