Phosphogens are energy-rich compounds found in muscle cells that serve as quick sources of energy during high-intensity activities. The most notable phosphogen is creatine phosphate, which donates a phosphate group to adenosine diphosphate (ADP) to rapidly regenerate adenosine triphosphate (ATP). This process is crucial for short bursts of energy, such as sprinting or Weightlifting, allowing for sustained muscle contraction. Phosphogens play a key role in the immediate energy system of the body.