Based on the provided reference, here's one way to attempt to pop your upper back:
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Position: The reference doesn't specify a starting position, so you may need to experiment to find what works for you.
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Head and Elbow Movement: Press down with your head and wing your elbows down towards the floor.
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Stretch: Continue the movement until you feel a deep stretch.
It's important to note that the reference is very brief and lacks crucial details about safety and proper form. Proceed with caution and consult a healthcare professional if you have any concerns. Attempting to pop your back can carry risks, and it's essential to do it correctly and safely.