Aiming at the causes of sports fatigue, one of the main means to alleviate sports fatigue is to reduce lactic acid in the body. Combined with the development and application of far-infrared fibers this year, using its physical properties and biological effects on the human body, the far-infrared energy reaches deep tissues and organs, causing the body to produce a warming effect, dilating blood vessels, accelerating blood flow, and blood Stagnation is reduced, which can reduce lactic acid in the body during exercise and achieve the purpose of alleviating fatigue. At present, far-infrared has been developed and applied in some fields. The research and deeper application of far-infrared in the fields of medicine and kinematics are the focus of future development.