We can't ignore the influence of low temperature on fitness. The harm of low temperature to human body is mainly local frostbite and hypothermia. If you exercise for a long time in a cold environment (such as long-distance running) and lose too much body temperature, there will be signs such as dizziness, decreased coordination ability and unstable walking. Don't lie down and rest at this time, or your body temperature will drop further, causing coma and even death. The correct way is to eat more high-calorie food, wear appropriate clothes and control the exercise time, so as to maintain the body temperature level and the normal function of the body, so that physical exercise can truly achieve the purpose of strengthening the body.

It is precisely because the adaptability of human body to high and low temperature environment is relatively limited that medical care scientists put forward the concepts of "heat-resistant exercise" and "cold-resistant exercise", that is, heat-resistant exercise is carried out at the turn of spring and summer, and cold-resistant exercise is carried out in autumn and winter. You can choose general fitness methods (such as running, playing Tai Ji Chuan, etc.). ) or take some ancient measures (such as adding or subtracting clothes) to make the physiological function of the human body adapt more actively. In this sense, fitness exercises in spring and autumn are particularly important. The diurnal variation of temperature in spring and autumn is also the biggest, especially in the morning when the temperature is low. We should pay attention to wind and cold to avoid respiratory diseases such as colds caused by morning exercises. Among many meteorological factors, temperature change has the most direct and obvious influence on fitness. As we all know, the human body has perfect thermoregulation function. Under different temperature conditions, the metabolic intensity and heat dissipation mode of the body will change accordingly to keep the body temperature constant. However, this ability to regulate body temperature is limited. When the temperature is too high (above 35 degrees Celsius), there is a problem of heatstroke prevention and cooling in fitness exercise. Old people and children are not suitable for sports at this time. People with strong adaptability to the hot environment (such as athletes and able-bodied young people) can exercise properly, but they must pay attention to supplementing water and vitamins and paying attention to a balanced diet. The amount of exercise should be from small to large, and gradually meet the predetermined requirements, and the exercise time should not be too long. When you feel unwell, such as rising body temperature, dizziness, headache and dry mouth, you should stop exercising immediately and rest in the shade.