There are approximately 600 000 surgeries performed each year in Sweden. Advances in surgical technique have led to a more complex surgery on patients with more serious comorbidities. This, in turn, has led to longer operations, which expose patients to longer periods of anesthesia. During anesthesia, muscle relaxant is used, the diaphragm is then relaxed and abdominal contents are pressing against the muscle and lung tissue behind. This in combination with surgery, supine position and immobilization during a longer period of time, has a negative impact on the functional respiratory capacity (FRC) even after the surgery. The ability to cough is eliminated and produced secretion remains in the airways increasing the risk of airway closure. Therefore, the risk of postoperative pulmonary complications (PPC) such as pneumonia, atelectasis (collapsed airways in the lungs) and respiratory insufficiency, is considerable. Mobilization (to sit, stand or walk) is believed to improve and normalize breathing after surgery. However, the isolated effect of mobilization immediately after surgery has previously not been studied.