Creatine creates ATP (energy) through the phosphagen energy system. This is the “shortest” energy system lasting 10-30 seconds & it resynthesizes stored creatine phosphate in skeletal muscles. Athletes that expend very large amounts of energy in short time periods benefit the most from creatine monohydrate supplementation. Supplementing with creatine may help you in increasing the length of time you can use the phosphagen system and the amount of times you can resynthesize creatine phosphate for more ATP production, for instance grinding out an extra few reps or sets or holding on to a sprint for longer.