1, it can be done in rainy days, but it is not recommended to dredge the back meridians because the skin pores are open after opening the back. If the weather is cold at this time, it is easy to cause cold into the body, making people easy to catch a cold.

2. It is recommended to open your back in spring. "Open your back in spring and you can live for a hundred years." Professor Chen Xiuhua, director of the Department of Traditional Therapy of Guangdong Provincial Hospital of Traditional Chinese Medicine, pointed out that opening the back can dredge meridians, promote diuresis and expel turbidity, and eliminate diseases and prolong life. Because the toxins and polluted air accumulated in the body for a winter, this season is the best time to discharge them.

3. Everything recovers in spring, and the yang is budding, which plays a vital role in the health-keeping activities all year round. Moreover, spring is the first of the four seasons, and the human body has accumulated a lot of vitality after three seasons of long summer, autumn harvest and winter storage. Only by adapting to the characteristics of spring, innovating, creating opportunities and protecting the yang in the body can we ensure a good mental state for one year.