literally just spouting hearsay, don't take this as fact -

My understanding is that slouching itself isn't all that bad. The issue is when you don't move around and shift your posture. If you slouch 24/7 it won't be good for you, but if you stand rigid as a plank all the time it won't be great either

& this part isn't even hearsay I'm just guessing, but I would guess it feels good for a similar reason that sugar tastes good. Even though we have an abundance of sugar (or time to slouch) nowadays, it was probably evolutionarily beneficial at one point to be encouraged to relax when possible.

https://www.reddit.com/r/explainlikeimfive/comments/120wv0m

This was covered less than a week ago fwiw.

If you slouch long enough, especially without support, it will hurt.

Good posture involves the muscles of the abdomen and hips to support the spine and hold the torso in an upright position.

When we are slouching, we aren’t engaging those muscles. So, I’m the short term, any t length of your back will start to ache from the strain of sort of hanging between your hips and shoulders.

In the long term, the muscles we should be using become weak and the poor posture causes damage to the spine, causing pain as our bodies rely more and more on the spine itself to hold us upright, when the meat Fram around the spine is supposed to be doing most of the work.

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