1. Start by lying on your stomach. Grasp your ankles or feet by reaching for it backwards, with your back arched and head up. From this position, rock forward and backward.

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answer: i would say the brain but it seem that you have a brain.

when you rub, you also apply pressure, that pressure can urge the poop to come out. i think that when your rubbing, you also might be slightly breaking it up and that can further fill the stomach.