Long story short, stress.
When you fill your bladder up with urine, the bladder expands, and the stress felt by your bladder muscle translates to the urgency to pee.
When you are sitting down, the chair actually provides pressure and force upwards, relieving SOME pressure.
But when you are standing, the only thing keeping the pee in is your bladder muscle and the bladder neck. and as you move, the liquid sloshes around, providing more stress to the muscle group, which is why walking, standing, and sitting will all provide a different level of retention.
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