Because running consumes a lot of calories, burns fat and accelerates blood circulation, at this time, people's body surface temperature is high, capillaries are dilated and sweat pores are in an open state. This is swimming in the water. Because of the body's natural protective function, capillaries contract and sweat pores close after a cold, which leads to the heat generated during running can't be dissipated, and metabolites and harmful substances can't be excreted with sweat, which is very unfavorable to human health. Swimming before running is a scientific fitness method.

Precautions for swimming

Avoid swimming before and after meals: swimming on an empty stomach affects appetite and digestive function, and accidents such as dizziness and fatigue may occur during swimming; Swimming with a full stomach will also affect the digestive function, and it will also cause stomach cramps and even vomiting and abdominal pain.

Avoid swimming after strenuous exercise: swimming immediately after strenuous exercise will increase the burden on the heart; A sudden drop in body temperature will lead to weakened resistance and cause colds, pharyngitis and so on.

Avoid swimming during menstruation: the reproductive system of menstrual women is weak, and swimming can easily cause germs to enter the uterus, fallopian tubes and other places, causing infection.