Chest physiotherapy includes a variety of interventions performed by physical therapists and breathing exercises performed by patients, that are designed to remove mucus from the lungs. This can help improve the function of the lungs and prevent lung infections. Methods of physiotherapy that do not require the help of another person are becoming more popular. These allow the patient more flexibility and more control over his/her healthcare. It is recommended that all CF patients who produce mucus in their lungs partake in some form of physiotherapy.