Muscle metabolism refers to the biochemical processes that occur in muscle cells to produce energy for contraction and movement. This involves the breakdown of nutrients, primarily glucose and fatty acids, to generate adenosine triphosphate (ATP), the energy currency of the cell. Muscle metabolism can occur through different pathways, including aerobic and anaerobic processes, depending on the availability of oxygen and the intensity of activity. During exercise, muscles primarily rely on glycogen, a stored form of glucose, for quick energy. When oxygen is available, aerobic metabolism efficiently produces ATP, while anaerobic metabolism generates energy rapidly but less efficiently, leading to the production of lactic acid. Understanding muscle metabolism is crucial for optimizing athletic performance and recovery.