What does it mean to store semen in winter and keep it in time?

The six solar terms in winter should be characterized by "everything is hidden, and kidney qi and water are flourishing", so as to avoid cold and temperature, astringe yin and protect yang, balance yin and yang, nourish and "hide" kidney qi, enhance physical fitness, prevent diseases and prolong life. Winter, the last season of the year, has experienced six solar terms: beginning of winter, light snow, heavy snow, winter solstice, slight cold and severe cold. People should exercise according to the characteristics of the six solar terms in winter. For example, in the six solar terms in winter, the weather is cold, the yin is strong and the yang is weak, and it is easy to suffer from yang deficiency. Whether for health care and longevity, or for tonifying deficiency and eliminating diseases, we should pay attention to warming and nourishing yang, and use nourishing yin drugs with caution or less.