All right. Tapping the back has the functions of dredging meridians, relieving pain, strengthening yang, harmonizing qi and blood, and helping to eliminate phlegm. The back is where the yang is, and the Du meridian and bladder meridian pass through, so slapping the back can not only dredge the back meridians and relieve muscle soreness. The beating of walnut buns can stimulate local skin, thus promoting blood circulation. At the same time, the beating of the walnut bag can also stimulate the local acupuncture points of the body, thus achieving the health care effect.