I sometime crack my elbow by extending my arm out in front of me with my fingers pointing down,and grasping my hand with my other hand before pulling it back and bending my elbow at a 95 degree angle. (This does not always work)

Any type of crack that can be repeated isn't actually a crack. Real joint cracks happen when pockets of air in between your joins escape, but what is happing to you is just the joints rubbing against each other.

Yeah, I can crack my jaw as well, my orthodontist says it is probably a form of TMJ but it wont really have any negative affects.

Doesn't work for me.

You are so lucky!

I am 14 years old, and lately have been feeling a lot of stiffness and soreness in my lower back/sacrum, but whenever I try to crack it nothing happens. I have tried most of the methods on this page and don't know what to do. Can anybody help me out?