Hi doc, lately i feel that my back sounds like cracking when i raise my leg or arm, is there any possibility that i have spine problem?

This is not likely: It may be the way you are built or that your musculature is just tight. Cracking noise or sensation can be from several origins ranging frim the small joints of your back "popping" like the cracking of 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.