This document discusses postural deformities, specifically kyphosis. It defines kyphosis as an exaggerated outward curvature of the thoracic spine, resulting in a hump on the back. Causes of kyphosis include lack of strength in the back extensor muscles, a forward neck position, and overstretching of the cervical muscles. Recommended exercises to address kyphosis focus on strengthening the back extensors and maintaining a neutral spine position.