hey Merry, it is technique mostly used by old women's which learn that from their mothers generation by generation. They are doing twice in 3 days without any charge since they consider it as a gift from God. You can pay if you want but noone force you.
I sent you link on private message and also I mentioned in my post that I doubt that anyone know to do it in USA. As soon as they finish you feel relief and It's not painful at all. I saw couple youtube videos where people shows how to do it by urself but didn't try it. You must search on my language if you want I will send you on pm.
Also old women told me that I can not raise my hands above my head next couple days, to avoid at all cost anything heavy *which is probably cause of my hiatus hernia* and to avoid stretching.