The process of glycolysis is a critical metabolic pathway that converts glucose into pyruvate, generating energy in the form of ATP. This anaerobic process occurs in the cytoplasm of the cell and plays a key role during high-intensity exercise when the body requires immediate energy. Glycolysis starts by breaking down one molecule of glucose into two molecules of pyruvate while producing a net of two ATP molecules. This process is essential for efficient energy production during various physical activities.