The elderly often have symptoms such as cervical pain or lumbar disc herniation, which determines that shaking hands will involve these pains when people walk in the special edition, so the elderly feel that the pressure on the cervical spine with their hands behind their backs is less, which will not affect the walking effect and make their bodies more comfortable. Therefore, most elderly people walk in the square with their hands behind their backs. The people who shake hands are basically aunts and grandfathers who dance in the square dance, because the body is fine.
Walking with one's hands behind one's back has something to do with one's living habits, because some elderly people just feel comfortable walking with one's hands behind one's back, and have a feeling of walking, because waving two arms always feels a sense of rushing, but they feel that they are enjoying life leisurely with their hands behind one's back, which is also related to their walking style, just like some people walk with eight characters outside, some people walk with eight characters inside, and some people just walk normally. This has something to do with this kind of physical activity when I was young, so it is not necessarily because of the cervical vertebra that the old men and women walk with their hands behind their backs, but also because of their living habits.
When you meet these old people who are walking, stay away from them. Don't bump into them when running, because most of them have hunchbacks, and it hurts to stand up straight suddenly. If you hit them and hurt them again, it may take a long time, energy and even money. It's better to stay away from them. Reduce a lot of troubles in our life, make our life smoother and not disturb the normal life of the elderly.