Most of us lack deep belly breathing.
In modern society where everything is non stop and there are deadlines to meet most of us tend to do too much shallow breathing.
Over time this can actually result in poor posture because shallow breathing (breathing mostly through the chest) tightens your pec minor (which is one of your chest muscles just in front of your shoulder) and makes you slightly rounded through your upper back as well as tightening your thoracic (mid spine).
What science also associates with shallow breathing is anxiety and increased stress levels due to the lack of oxygen circulating through the body.
How can you change?