I dont. The first time I did it every vertebra in my column cracked, much to my delight.
but soon after i realized i couldnt go a day without cracking my back and it really sucks. This happened when i was in highschool, around six years ago and back then it didnt pose much of a problem but now, well, im ronery and dont have any friends to crack my back.
It feels stiff and awkward.
tl;dr, dont stretch like this.