Phosphocreatine is a high-energy compound found in muscle cells. It serves as a quick source of energy during short bursts of intense physical activity, such as sprinting or weightlifting. When the body needs energy, phosphocreatine donates a phosphate group to adenosine diphosphate (ADP), converting it into adenosine triphosphate (ATP), the primary energy currency of the cell. This process helps replenish ATP levels rapidly, allowing muscles to continue functioning effectively during strenuous exercise. Phosphocreatine levels can be increased through dietary sources, such as meat and fish, or through supplementation, which may enhance athletic performance and recovery.