The sub-health status of urbanites is getting more and more serious. More people are paying attention to their own health status. They want to reshape their healthy bodies in various ways, such as diet, tonic, massage, etc., but the most effective effect. The most notable should be outdoor sports. Although the air quality index of many large and medium-sized cities is not optimistic, only to find time, avoid the time when air pollutants gather, or you can breathe fresh air….