Inclusion Criteria:  Diagnosis of idiopathic pulmonary fibrosis (IPF) or other fibrotic interstitial lung disease, with a minimum of > 10% fibrosis on computed tomography imaging. Clinically meaningful breathlessness: modified Medical Research Council (mMRC) dyspnea score >1.  Exclusion Criteria:  Inability to walk (orthopedic/neurologic/cardiac limitation causing immobility). Cognitive impairment or inability to understand and follow instructions. Traditional PR completed within 3 months of study recruitment. Hospice or end-of-life care at the time of screening. Acute exacerbation at the time of screening.