YOGA-CF (Yoga Outcomes Get Assessed in Cystic Fibrosis)

Inclusion Criteria: Diagnosis of CF (confirmed by standard criteria; (Farrell et al. 2017)) Sixteen years of age or over Home internet access Ability to complete questionnaires in English Stable CF disease as judged by the investigator, a senior CF clinician Exclusion Criteria: Inability to consent for treatment or measurement Current participation in another interventional study of a medicinal product Current haemoptysis (greater than streaking in the sputum) Known pregnancy at time of recruitment Forced expiratory volume in 1 second (FEV1) below 30% predicted at baseline Use of ambulatory oxygen therapy, long-term oxygen therapy (LTOT) or non-invasive ventilation Current regular participation in yoga practice Current neurological or musculoskeletal injury which would prevent completion of yoga Diagnosis of osteoporosis (bone density Z score \<-2.5) or history of spontaneous spinal fractures Uncontrolled gastroesophageal reflux Acute pulmonary exacerbation within 28 days of screening