Chest physiotherapy is a form of treatment that helps to clear mucus and other secretions from the lungs. It is often used to treat conditions such as cystic fibrosis, chronic obstructive pulmonary disease (COPD), and pneumonia. Techniques used in chest physiotherapy include deep breathing exercises, coughing, and chest percussion (clapping or vibrating the chest to loosen secretions). The goal of chest physiotherapy is to help patients breathe more easily and improve lung function.