Vol. 6, Issue 4, Part A (2020)

Abstract
Background: Ideal posture is when the body parts, muscles and bones are aligned and work together in harmony, protecting the body from injury or progressive deformity, regardless of the attitude. Rounded shoulders is a typical bent posture in which the scapulae are elevated and the acromion is protruded forward in comparison with the center of gravity of body. Rounded shoulders results from the shoulder being pulled forward by shortened or tight anterior shoulder girdle muscles, like pectoralis minor, pectoralis major and upper trapezius muscles, lengthening and weakness of rhomboids and lower trapezius. Respiratory muscles play an important role in overcoming lung, chest wall and airway resistances normally occurring during inspiration. Efforts by the respiratory muscles are required to enlarge the thoracic cavity and lower intrathoracic pressure. The tightness of pectoralis and scalene leads to decrease in chest expansion. Decreased chest expansion leads to decrease in the vital capacity and total lung volumes. An elastic band is a rubber band with elasticity and resistance, and the velocity and intensity of an elastic band can be controlled.