Muscle produces lactic acid mainly through glycolysis anaerobic respiration, lactic acid accumulation will cause muscle soreness, the lactic acid produced can be regenerated into glucose through the lactate cycle. Muscle contraction requires energy consumption, which is mainly supplied by glucose oxidation. Glucose oxidation is divided into aerobic tricarboxylic acid cycle oxidation and anaerobic oxidation. Anaerobic oxidation is less dependent on oxygen, and glucose is directly converted to lactate and produces energy after the production of pyruvate. The anaerobic oxidation of large amounts of glucose results in a buildup of lactic acid. The production of lactic acid by muscles is the body’s way of supplying energy in emergencies to sustain the energy expenditure of muscles after an emergency start. However, the buildup of lactic acid causes muscle soreness, which is usually relieved by rest. After lactic acid is produced, it gradually enters the bloodstream and is transferred to the liver, where it is reconverted to lactic acid via the gluconeogenesis pathway to supply the body with energy. Excessive accumulation of lactic acid in the blood can cause lactic acidosis, which requires prompt medical attention to avoid delaying the condition.