Is this a serious question? Slouching puts pressure on your lower back.
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According to a study in Britain slouching is actually better:
http://www.foxnews.com/story/0,2933,232237,00.HTML
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Slouching is not good for you because it dangers your backbone and the bones in your shoulders if you always do it. Sloching damages your proper posture, you must maintain proper posture to be healthy. Slouching also makes you look lazy and improper.