The purpose of this observation study is to evaluate the effects of an early, 3 week lasting rehabilitation program, that starts roundabout 4 weeks after lung or combined lung transplantation, on physical activity, functional and physical condition (6-min-walk, FEV1, ADL-score) and quality of life (SF36) in lung transplant recipients with a different length of stay on the waiting list and a different duration of hospitalization in the transplantation centre after transplantation.