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backless chair? that seems rather counterintuitive.. wouldn't you want a chair with a lot of lumbar support?

i can definitely relate with thighs angling slightly downward though.

Not having a chair back means my muscles have to work to keep my back upright: there's no way to slouch backwards. Correctly postured, that work is minimal, but keeps the muscles working and healthy.

A chair back with lumbar support prevents you from sitting in a bad posture, but doesn't help develop the muscles that naturally promote good posture.

Even better would be if I could get rid of my desk so I have no way to slouch forward.

Ideally you sit board-straight with your spine stacked on itself, constantly micro-adjusting to keep you centered. Slouching actually came about as a young person trend (I think in the '20s?) that made sitting up straight seem stiff and uncool.

woah, interesting

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