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.