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					Originally Posted by limey
					
				 
				The way it tilts your pelvis forward with the sloping seat means you have to sit straighter. When I sit "wrongly" on it, I lean with my elbows on the table in front of me, but my back is still pretty straight 
			
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 I always managed to just slump higher in my back. I looked like a total hunchback sitting in those things, nevermind that they hurt my knees.
There was a woman I used to work with who just sat on a huge inflated exercise ball at her desk, and she swore by it. She said a physical therapist had told her to do it, because the constant tendency to sort of bounce and rock around ever so slightly built back strength and prevented any significant slumping (because you'd fall off.)