Every day from 8: 00 to 12, from 14 to 17, muscle speed and strength endurance are at their best. If you do physical exercise and sports training during this time, the effect will be better. But from 3: 00 to 5: 00, 12 to 14, it is in a relatively low state. If you are engaged in sports during this time, you are easy to get tired, and when the "load" is too large, the probability of sports injury is high. People are used to thinking that morning is the best exercise, followed by dusk, because the air is freshest at that time. However, due to urban air pollution, the best exercise time has also changed. Studies have proved that under normal circumstances, air pollution has two peaks every day, one before sunrise and the other in the evening. Especially in winter, under the influence of cold and high pressure in the morning and evening, the phenomenon of inverse temperature rise often occurs, that is, the upper air temperature is high, while the ground temperature is low, and the atmospheric convection almost stops. Therefore, harmful pollutants on the ground cannot spread to the upper atmosphere and stay in the lower respiratory tract. This phenomenon is particularly typical in residential areas with concentrated industries or high-rise buildings and on both sides of roads where cars fly by. At this time, the harmful gas is 2-3 times higher than normal. A healthy adult breathes 16-20 times per minute and inhales about 10 cubic meter of air every day. During exercise, due to the needs of metabolism, the inhaled air is often 2-3 times that of normal state. Therefore, the choice of environment and time during exercise is particularly important. When is the cleanest air? Experimental research shows that 10 am and 3pm are the two relatively best time periods every day. Therefore, I remind everyone that we must cherish this wonderful time. Because at this time, exercise can not only relax you, but also breathe high-quality fresh air. Because everyone lives and works in different ambient air quality, we should pay attention to the change of air pollution index when exercising outdoors. If the air pollution index is too high for a period of time or in a certain area, it is necessary to adjust the sports venues. Drinking water during exercise is not good for your health, and you may choke!

Please accept it, thank you!