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Proper posture should be achievable without tucking your chin. It is a common reaction to try to tuck the chin when you bend a bit fwd to connect the bottom of the ribs with the top of your pelvis/pubic bone. You need to develop the ability to do that AND be able to have your neck in neutral position, stacked on top of the spine. You should be able to do this in any position, while lying down or standing.