Can't take a shower. Because the blood circulation of the body is accelerated after exercise, the capillaries are dilated, and suddenly stimulated by supercooled or overheated water, the capillaries will contract rapidly, or even rupture, and blood will seep into the body from the capillaries, causing various diseases. If the cerebral capillaries rupture, it is cerebral hemorrhage, and if the visceral capillaries rupture, it is visceral hemorrhage. Of course, this is an extreme situation. Not everyone will have an accident taking a bath immediately after exercise, but we must have this safety awareness.