The human wrist is a marvelous thing. It can bend forward and backwards, and make circles right and left. It can bend up and down and a little
sideways, but it definitely has it limitations on where and how far it can bend
in any of these directions. And the entire art of wrist locking is in knowing
how and where to over bend and over stretch the wrist to cause severe and
immense pain and disable or control your attacker.
Author: Dr. Ted Gambordella, 5th Dan