Chronic Obstructive Pulmonary Disease (COPD) is a progressive disease and the number of patients is increasing. Persons with COPD have a low physical capacity and a low physical activity level. The risk of premature morbidity and mortality is high especially in persons with a low level of physical capacity and activity. Rehabilitation including physical training is recommended and results in decreased morbidity and mortality and increased physical capacity and quality of life. Unfortunately improvements decrease if patients do not maintain their physical activity level.