Inclusion Criteria:  Diagnosed with GOLD stage I-II COPD Between the ages of 40-65 COPD in stable period No other respiratory disease that impairs respiratory functions such as asthma Knee flexion angle of 15 degrees and above in the hamstring muscle shortness test, Individuals without musculoskeletal problems in their lower extremities were included.  Exclusion Criteria:  COPD patients who receive home oxygen therapy or who need oxygen therapy frequently COPD exacerbation, hospitalization with acute exacerbation in the last 15 days Pregnancy Kyphoscoliosis, advanced postural disorder Prior thoracic surgery Advanced heart failure Patients with primary pulmonary hypertension or have had a pulmonary embolism, Having serious neurological diseases such as Parkinson's, hemiplegia, multiple sclerosis, Neuromuscular disease Having dementia, Alzheimer's or advanced cognitive problems, Diagnosed with lung cancer or other malignancy, People with morbid obesity will not be included in the study.