Totally enclosed, the air quality is poor, and sweating in the face of cold air conditioning is the chief culprit of illness due to improper fitness. Fitness in a gym with central air conditioning may not do much harm to the body, but in a gym without central air conditioning, you must be careful not to blow against the air conditioning, because after exercise, the blood vessels on the skin surface dilate, the pores open, and the lactic acid secreted by muscles increases, which easily causes muscle soreness after the body is exposed to the wind.

Originally, the purpose of fitness exercise was to make the body sweat, but the indoor temperature is too low, which will make athletes sweat, leading to pore blockage and colds. If the gym space is relatively closed, narrow and crowded, sweat and microorganisms on the human body surface will increase accordingly, and bacteria, viruses and pathogens in the air will accumulate, which will easily induce respiratory diseases such as pharyngitis and tracheitis.

Because you consume a lot of physical strength, you need to breathe a lot of fresh air and emit a lot of carbon dioxide. Especially in the gym, if there is no good ventilation and convection device, it will lead to the continuous circulation of exhaust gas in a limited space, which is unfavorable for exercisers doing aerobic exercise. During exercise, the indoor temperature should not be too low, and should be controlled at around 26 degrees Celsius.