The fat in human blood can be excreted from blood vessels through many tiny pores in the arterial wall, but the premise of this excretion is that the fat in blood vessels can only penetrate these pores after combining with high density lipoprotein. The higher the HDL content, the more fat can be effectively excreted. Exercise can increase the content of high density lipoprotein in blood and reduce blood lipid. After eating a fat-rich diet 1 ~ 2 hours and doing some proper exercise, the content of high-density lipoprotein in the body will increase obviously, so that the fat in the blood can be discharged before it is deposited in blood vessels; At the same time, exercise can also accelerate the heartbeat, enhance blood circulation and promote fat energy metabolism. Under the action of these aspects, the blood lipid content in blood vessels will be greatly reduced, which is extremely effective in preventing or slowing down atherosclerosis and avoiding the occurrence of cardiovascular and cerebrovascular diseases.