Because you decide to move it first.
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It's what happens when you have a leg amputated.
When your running on your right leg.
When you move your right leg, it may cause your back to pop due to the release of gases from the joints, specifically the facet joints in your spine. This is typically harmless and occurs when the joints are moved in a certain way, allowing the gas bubbles to escape and create the popping sound. However, if you experience any pain or discomfort along with the popping, it would be wise to consult a healthcare professional.
The right leg?
They aren't.