 Cystic fibrosis CF is a lung disease that affects 30,000 children and adults in the US. Incorporation of regular exercise into the lives of patients with CF is of interest because it may improve lung function and quality of life. Yoga is an activity that may benefit patients with CF in many ways including strengthening muscles of breathing, improving lung function, and reducing stress which could improve quality of life and adherence to therapies. Yoga has been shown to be beneficial in patients with other lung diseases such as asthma, but has not yet been studied in CF. 