Hard to explain. It feels like I cannot expand my chest completely, almost structural. It will happen for several breaths and then all of sudden I can get a full breath again. Similar to the feeling of not being able to complete a yawn. Very dissatisfying but does not seem to be limiting in any other way. Also, when I roll my shoulders and lean over, I can usually get a full breath. I can deal with the shortness of breath issue at rest, but when I try to run, I feel like it is keeping me from getting back into shape. Hope this all makes sense? It is a bit confusing.