The reason lies in two "main forces" in massage oil: the first main force: it has a nice name "Thyme", which is rich in volatile essential oil and thymol, smells fragrant, and is good at reaching the brain through meridians and blood vessels, exciting the central nervous system and promoting the activity of brain cells; At the same time, it also has a powerful and stable function of excreting dirt and dissolving toxins and excess fat in the body. The second main force: it is an important formula commonly used, called "cypress". It was introduced as early as in Compendium of Materia Medica. Sibai has the effects of expelling wind and detoxicating, promoting qi circulation and relieving arthralgia, promoting blood circulation and dredging collaterals, expelling wind and removing dampness, dredging meridians, dredging viscera and clearing pathogenic heat, which shows that it also has a strong effect of "dispersing" and "expelling".