Good cardiorespiratory fitness can be characterized by the body’s ability to perform daily living and learning activities, increased activity tolerance, and the ability to perform more strenuous normal exercise without the combination of cardiorespiratory disease. When activity tolerance decreases and cardiopulmonary impairment is considered, a 6-minute walk test can be performed under the supervision of a physician to evaluate pulmonary function. When the 6-minute walking distance is <150m, severe cardiopulmonary insufficiency is considered to exist, 150-425m moderate cardiopulmonary insufficiency, and 426-550m mild cardiopulmonary insufficiency. If necessary, you can also go to the hospital to further complete the pulmonary ventilation function test, chest CT and other assessments of pulmonary function, as well as cardiac ultrasound and other tests to assess cardiac function, to understand their own situation in more detail.