You see many people do it. You know they turn their head quickly to “crack it”. There is always someone somewhere plaing amatuer Chiropractor, and “lifting” someone up to “crack their back” Again; What is it that makes the cacking sound, in the neck and back, when we do it, or have someone do it for us. Another example is when you firmly planted feet, and swing your body left to right, to “crack” your back. I know when I do some yoga like streching, I roll on my back and that also makes “little cracking sounds” in my spine, that I could only hear internally. Another question will ask about any heath benefits, dangers, etc. This question just asks what is it that causes the “cracking” sound to happen?
