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I know this isn't really anything to complain about, but I'm curious as to why I seem to find running on undulating ground a lot easier and a lot more enjoyable than running on the flat. I always get tight, achey shins and calves and feel generally heavier and less energetic when running on level ground. Surely, logically, training on hills regularly should make running on the flat easier?
I've always trained on hilly routes, so is it possible that the muscles involved in pushing me uphill are overtrained compared to my other leg muscles? Perhaps it's just boredom exaggerating the difficulty of the flat?
Any ideas much appreciated, I've got my eye on a fairly flat 10k near me this summer