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Description

I’m no doctor, but I’m pretty sure that isn’t normal.

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Background Pony #668D
There are many contortionist poses that any healthy person can learn to do. With enough practice and dedication you can learn sit on your own skull in a backbend, perform autofellatio in a frontbend. I have video chatted with a very talented individual who can place his shins behind his back without assistance from his hands or arms.
 
However rotating your skull 180 degrees most likely requires a specific genetic advantage and the average healthy person could not learn no matter how much practice they put into it. Example: https://www.youtube.com/watch?v=bHjRORiMl7E