During exercise, metabolic demand of skeletal muscles need to be required by the changes of ventilation, cardiac output, pulmonary and systemic circulation in order to provide oxygenation and to prevent the acid-base status of the body. Exercise tests are used to determine the functional exercise capacity, predict the prognosis, evaluate the clinical study results and assess the treatment response in chronic lung diseases. Cardiopulmonary exercise testing and field tests (incremental shuttle walking test, endurance shuttle walking test, six minute walking test) are currently used. Among them, the most common used exercise test is the six minute walking test. Stair climbing test, incremental shuttle walking test and cardiopulmonary exercise testing are recommended to assess the lung cancer patients who are candidates for lung resection. A cardiopulmonary exercise test is indicated when the postoperative predicted (ppo) FEV 1 or ppo DL CO (or both) are < 30% or when the performance of the stair-climbing test or the shuttle walk test is not satisfactory. A peak oxygen consumption (VO 2 peak) < 10 mL/kg/min or 35% predicted indicates a high risk of mortality and long-term disability for major anatomic resection. Conversely, a VO 2 peak > 20 mL/kg/min or 75% predicted indicates a low risk. Six minute walking test can not be recommended as a standart exercise testing tool since there is a lack of data in the preoperative assessment for lung resection.