Can you solve? Neck/Back issue

[physiobob]

Sounds like the crack is probably coming from you scapula (shoulder blade) rubbing on/over underlying tissues. This is very common and not a real issue unless you continue you do it for fun, in which case it will become painful.

As to what structures this might be? Well this could include the first rib, subscapularis, levator scapulae etc. It could also be the acromioclavicular joint if the crack/click is where the collar bone joins the shoulder blade. Basically the connections to the neck and shoulder blade. Often this is made worse with a tight thoracic spine (rib cage) and poor muscular development of the back muscles - rhomboids and lower part of trapezius. This is difficult to resolve fully and often this takes a long, long time. Some people are just born/develop that way.

Best bet is to book in with a good manual therapist for an assessment and diagnosis. If dance is your thing then a rehab program with someone interested in sports biomechanics would seem appropriate.