From the “reliably”, “repeatedly” and “systematically” in FeepingCreature’s comment, I guessed they weren’t talking about a previously sedentary person just starting to exercise. (I think I was going to clarify I was mainly talking about the middle and long term, but forgot to.) I do expect it to be normal for my muscles to hurt when I’ve just started exercising after weeks of inactivity.
From the “reliably”, “repeatedly” and “systematically” in FeepingCreature’s comment, I guessed they weren’t talking about a previously sedentary person just starting to exercise. (I think I was going to clarify I was mainly talking about the middle and long term, but forgot to.) I do expect it to be normal for my muscles to hurt when I’ve just started exercising after weeks of inactivity.