Several reasons: It may be the way you are built (spondylolysis) or that your musculature is just tight. Cracking noise or sensation can be from several origins ranging from small joints of your back "popping" like cracking your knuckles to tight soft tissue structures giving the same sensation when stretched or moving over one another or another musculoskeletal structure. It is not a pathologic or bad thing.
Answered 1/18/2018
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