Therefore, The investigators interested in the pattern of marching exercise that use both upper and lower extremity and used for exercise test in COPD patient. The investigators expect that marching can increase the performance at maximum level nearby 6-MWT COPD is a major disease in Thailand that not only affects the quality of life for the patient but also is a burden for their family and society at large in terms of the costs of health care and loss of economic activity. Improvements in diagnosis care and treatment can help to minimize the problems but the first stage is diagnosis and assessment. Despite the fact that there are many different exercise protocols that have been used for this purpose there is still an need for a test that is easy to use, especially in the community, and one that involves both arms and legs and is more representative of the activity of daily life. This project is concerned with developing such a test.