Precautions:
1. Don't exercise excessively. Proper exercise is good for your health.
2. Don't keep the same sitting posture for a long time. Sit for half an hour and be sure to stretch your shoulders or neck and waist.
3. Pay attention to cold and warmth, especially to avoid cold shoulders.
4. Strengthen functional exercise, such as playing Tai Ji Chuan and Tai Ji Chuan croquet frequently, or hanging your arms at home, using a stretcher, dumbbells, cutting, etc., but pay attention to the amount of exercise, so as not to cause damage to the shoulder joint and its surrounding tissues.
Sometimes I go fishing in the ditch. There is water in the ditch, and the flow rate is relatively fast. The water in the ditch is clearer than that in the fish pond. I also took a bath in the ditch because I like the rushing water, but once I met a water snake swimming in the distance, which scared me and my friends to take a bath and play in the ditch.
The water that often flows will not stink, but it will look clearer, while the water that doesn't often flow will gradually turn black and stink. There is another word in the idiom called stagnant water, which is lifeless.
The hinge that rotates frequently will not be eaten by insects and will not break after a long time. Whether it is water or hinge, as long as it flows frequently and rotates frequently, it will not break down over time and will not be easily eroded by foreign objects.