Why does the body become stiff when the weather is cold?

When the weather is cold, blood vessels contract, blood circulation is slow, and the body becomes stiff. The solution is to keep warm. Pay attention to keep warm, put on more clothes, or take a hot water bottle to warm your baby, or eat hot pot and drink soju to warm your stomach. With more calories, the blood circulation will be faster, which is why it is particularly easy to get hungry in winter. I don't know if I'm satisfied. There is also the ability to improve blood circulation through a lot of exercise. Burn your feet and take a hot bath, especially before going to bed.