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Another thing to note: slouching and back pain tend to have more to do with back strength than people realize.

I have suffered back discomfort and pain in periods I haven’t gone to the gym for long enough to lose back muscle.

Does it? I think strength may be related to pain if you're very weak, and statistically there are big confounders (i.e. people who are weak also have other conditions that exacerbate pain experience). But past a certain point I don't think the evidence suggests that strength itself is protective. Otherwise, competitive lifters would never experience back pain for instance, but they still do. Pain is multifactorial, and strength is not the only determinant by far.

Never said it’s the only factor, and we shouldn’t assume all pain is the same pain

The type of pain people weight train suffer tends to be related to muscle or tendon damage. The type of pain that comes from sedentarism tends to be related to overworked (weak) muscles and bad circulation.

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