Inclusion Criteria:  Being diagnosed with interstitial lung disease (idiopathic pulmonary fibrosis, collagen vascular diseases, sarcoidosis, etc.), Being clinically stable, Not receiving supplemental oxygen therapy, No pulmonary infection in the last 6 weeks, Being ambulation.  Exclusion Criteria:  Presence of obstructive pulmonary disease such as chronic obstructive pulmonary disease (COPD), asthma, bronchiectasis Presence of a history of effort-induced syncope Presence of severe orthopedic or neurological disease Presence of unstable serious cardiac disease