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> For me an average pace of 3:52 is great, while 4:12 is very bad.

Um, that’s very fast. At my pace (8:45 or 5:26 in km), I barely notice the discrepancies on my Apple Watch 7.

I think the op is talking in kilometers and you’re talking miles.

A 40 minute 10k is very fast, especially for a training run that is done many times a week.