The body surface of the human body is not flat, and grooves are often formed at the starting and ending parts of some joints or muscles, commonly known as "sockets", such as shoulder sockets, armpits, elbow sockets, popliteal sockets, etc. Regular massage of some acupoints in the "nest" will have unexpected health effects. For example, daily massage or moxibustion on the point of Jiandang located in the shoulder socket can promote blood circulation, improve the body's resistance, dredge the wind and firm the surface, promote blood circulation and dissipate wind, facilitate joints, and dissipate phlegm and dampness. When the upper arm is extended and raised horizontally, the shoulder joint can present two
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