Thoracic Extension, Weird Pop

[adpowah]

So I've been working on my thoracic extension and working on my posture. It's been going great and my shoulders, chest and neck have all been improving. Sometimes though when I do thoracic extension stretches I get this pop from the middle of my chest. it feels fine, even good, like when you pop your back. It doesn't happen on queue, basically just when I have been overly hunched in for too long. Any idea on what's going on?

 

[TangoDown]

That's happened to me before. Probably air. Don't worry about it.

 

[adpowah]

Yeah, not super worried just not sure what exactly is making the noise.

 

[Old and Grey]

Could be the sternum or manubreum popping in and out of place. Not a problem unless you hear a loud snapping noise. Or it could just be tendons creating minute air/gas pockets when moving back vertebrae. Unless you experience pain, don't worry about it.