Why do your bones crack?

Why do my bones crack so much? Please read description!

• Before, I used to not stretch everyday, and my bones would never crack a lot.. but now, I've been stretching everyday for an hour and a half for about a month now, and whenever I sit for long periods of time (in school and such) some random bones of mine crack and I really want to know why! Is this a product of my stretching?

• Answer:

  you need to see a doctor. obviously there is not enough fluid (sinovectic fluid) in joints. it's not the bones which crack but the joints. the doctor can check and prescribe or recommend some suplements to better the situation.