You can't take a cold bath immediately after running, you will get sick. Usually, people breathe through the nose, but when running, because of the intense muscle activity, the required oxygen is greatly increased, so they have to use their mouths to help them breathe.

It's very cold in winter, and sometimes there will be sandstorms. If you breathe with your mouth open while running, cold air directly stimulates the mucous membranes of the mouth, throat and trachea, making the mucous membranes of these parts dry and uncomfortable, which will cause cough.

So when running in winter, try to breathe through your nose, or breathe in a mixed way. At this time, the mouth should be half open, the mouth slightly open, the tongue raised, and cold air inhaled through the teeth, so that cold air has a warming process in the mouth. Breathing through the nose at the beginning of running and breathing through the mouth after getting used to it can also avoid cold air directly irritating the mouth, and the phenomenon of coughing will be reduced and avoided.

The speed of fitness running in winter should not be too fast, so you should feel the pressure of speed. It is not advisable to sweat a lot. It's best not to be short of breath. I feel a little short of breath but not in a hurry. The rhythm should be moderate, faster, and the number of laps, that is, the distance, depends on your own situation. At that time, I was hot all over, just sweating. At this time, you can slow down, take off a dress for a long time, keep warm after running, and get dressed in time.

Mainly pay attention to fog.

Fog is a common natural phenomenon that the ground temperature drops and saturated water vapor condenses on condensation nuclei such as dust, particles and bacteria. Due to the ground radiation inversion, foggy days frequently appear in autumn and winter. When it comes to fog, people will think of its harm to traffic. Due to air pollution, the nucleation properties of fog have changed, and the harm of fog to human body is becoming more and more serious. After people breathe polluted smog, the incidence of rhinitis, pharyngitis, bronchitis and lung cancer increases obviously.

Fog is very harmful, it can not only cause traffic accidents, flight delays, communication lines interruption and other accidents, but also the harm of air pollution to human health can not be underestimated.

Why does foggy weather aggravate air pollution and endanger human health? It turns out that when tiny water droplets float at low altitude to form fog, some harmful substances on the surface, such as acid, alkali, amine, salt, benzene, phenol, dust and pathogenic microorganisms, are dissolved and adsorbed in the small water droplets. The formation of fog makes these harmful substances stay and accumulate without diffusion and dilution, and the pollution is correspondingly aggravated. If the fog lasts for a few days, the pollutants in the air will increase rapidly. If people exercise in fog, these harmful substances are inhaled or exposed to too much, which will cause tracheitis, laryngitis, pneumonia, rhinitis, conjunctivitis and allergic diseases.

When morning exercisers exercise, due to the strengthening of muscle and bone activities, the heat production in the body increases. In order to maintain heat balance, it is necessary to use perspiration to dissipate heat. However, in foggy weather, when the air pressure is high and the temperature is high, sweat is not easy to evaporate, which is not conducive to skin heat dissipation and hinders gas exchange in alveoli. In this way, people will feel sultry and uncomfortable, with chest tightness, breathlessness, fatigue, dizziness and other symptoms, and it is easy to cause colds, hypertension, coronary heart disease, respiratory diseases, cerebral hemorrhage and so on.

If there is fog in the morning, these fogs will often suck air impurities and even bacterial pathogenic microorganisms into people's upper respiratory tract. When the human body's resistance drops, respiratory tract infection will flow to the lower respiratory tract, that is, bronchopneumonia, including lung cavity infection and even chest infection, which will further aggravate the condition, so it is best not to go out for a walk in foggy days to avoid such weather. In addition, for patients who have undergone surgery or lung cancer surgery in the past, we should pay attention, because his department has caused some trauma, and if we do not pay attention to the stimulation of cold air and air pollution, it will aggravate the condition.

Harmful substances such as acid, alkali, benzene, phenol, dust and pathogenic microorganisms are dissolved in the fog. And the carbon dioxide released at night is deposited at low altitude in foggy days. If people inhale dense fog, harmful substances will enter the body in large quantities, which will also cause insufficient oxygen supply and chest tightness.

Exercise in the morning is not as good as exercise at night. As far as people's physical condition is concerned, sleeping all night, the body is in a state of water shortage in the morning, blood is sticky, and strenuous exercise may cause dangers such as insufficient blood supply to the brain, cerebral hemorrhage and myocardial infarction. If you like morning exercises, I suggest you drink 1-2 cups of boiled water after washing, and then exercise. From the environmental point of view, some toxic gases in the air are difficult to volatilize before the sun comes out, which is not suitable for exercise. From the follow-up reaction, it is easy to eat more after exercise in the morning, but it increases the intake.