For years my husband would make visits to the chiropractor twice a week to get his back "adjusted". He was the chiropractor' s best customer.
Then one day the chiropractor was nice enough to tell my husband how to "crack" his back. Now I have been doing it for several years and he only makes one visit to the chiropractor a year.
Here is what I do to crack it. It's pretty simple to do and it doesn't hurt.
Basically the idea is to put slight pressure in the middle of the back so that it "cracks" slightly and relieves pressure and pain. You might get this affect by just having a child sit on your back and it cracks. Just like cracking your knuckles..same idea.
Have the person that needs to have his or her back cracked lie down on their stomach on a bed. Have their head at the edge and face them.
Next they will need to inhale deeply and then exhale.
Now take one hand and place it over the other hand. Lay your hands in the top middle part of the person's shoulder blades. When you know that they have exhaled, press both hands firmly down and press with a little of your weight. Move slowly down the middle of the person's back and repeat. If it works you should hear a small "pop". I will sound like someone's cracking their knuckles.
You can also ask the person to lay on the floor on their stomach and then have one of your kids walk on their back. This will have a similar affect. You will hear a "pop".
If you currently see a chiropractor, ask them to show you how to do this.