Yes, the reason why fitness can relieve stress is that when the amount of exercise reaches a certain level, the body will produce a lot of peptides, which is a hormone in the human body and is called' happiness factor'. The function of peptide can delight people's nerves, drive away stress and make people relax physically and mentally. During exercise, the blood circulation of the body is accelerated, and a lot of sweat is discharged, which stimulates the cerebral cortex and brings pleasure to people, so people will relax a lot after exercise.

Peptide plays a carrier role in human body, mainly because it can carry various nutrients that human body usually eats, such as calcium, iron, zinc, manganese, selenium, etc., on its own body and transport them to the needed parts of human body to meet the normal physiological functions of various tissues and organs of human body. All kinds of macro-elements and trace elements must be combined with peptides, otherwise they will not be absorbed by human body, and will produce in-situ precipitation and be excreted. Peptides can be synthesized into cells after being absorbed by the human body, and can also play a regulatory role. Peptide can regulate the related enzymes in the body and ensure the smooth metabolic pathway; It can also influence the synthesis of protein by controlling transcription and translation, and finally produce specific physiological effects or exert its pharmacological effects. Peptides are involved in regulating substance metabolism, hormone secretion, nerve activity, cell growth and reproduction. Glucagon, for example, is a polypeptide composed of 29 amino acids, which can promote the degradation of hepatic glycogen to produce glucose to maintain blood sugar level, and can also cause vasodilation and inhibit intestinal peristalsis and secretion.

Peptide plays the role of immune regulation and antibody in human body: after peptide enters human body, it first fuses with human cell membrane, injects its own genetic material into the nucleus, and makes cells produce immune antibodies. Therefore, when the virus cells enter the human body, they should also fuse with the human cell membrane and inject their own genetic material into the nucleus, and then the cells will become inflamed and infected, which will affect many cells, cause diseases and endanger life. However, when they enter the human body, the peptide has fused with the cell membrane to produce antibodies, so virus cells are not allowed to enter, just stay in the blood and flow, and will die after 4 hours. The human body will not get sick or be infected by the virus.