The escape of gases from the joints in your back, or tendons returning to their original place. This is not determined to be harmful
I think the tiny drip of water makes it pop
Your bones There are gases that build up between your vertebrae. When you "pop" your back the noise you hear is the gases being released.
i horse back ride and my back does not pop.
The HEAT makes it pop.
the spit inside your mouth
There are many ways that you can pop your back if you need to. You can do this by bending over a chair.
since the Balloon's latex is stretched so tight when you blow it up, poking it with something breaks the membrane of latex and makes a loud *pop* sound when it snaps back.
The thing that makes a pop up card a pop up card is that when you open it something pops out and that can be anything(paper-box,bouquet,face,hat etc...)
The bubbles pop when they reach the surface of the liquid, yes. It makes a fizzing noise.
Your lower back may pop without pain if you have air in your spine. No pain is a good sign and it just means your back needed to pop.