I completed level 2 in my training on Saturday by participating in a 10k race for a local church here. Even without the 1˚C (33.8˚F) temperature and brisk winter wind, it was an interesting experience.
I warmed up well, started out by climbing up a reasonably steep but short hill, and proceeded through what was a beautiful, not-terribly-strenuous walk to complete the first 5k loop. I found that although I wasn't breathing hard or feeling like I was exerting myself beyond my comfort zone (keeping up with about a 7 on the RPE in my estimation), I was pushing myself beyond my ideal heart rate, and my muscles got very tired, very quickly - which is unusual, as I walk a 10k or more almost every week with no issues whatsoever.
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