One of the keys to success for anyone who exercises is to keep the muscles and brain energized. When muscles need quick, explosive energy, as in weightlifting or sprinting, the body resynthesizes this ATP supply using creatine phosphate. More creatine in the muscles would mean more CP to unleash more energy.
Muscles then are able to do more work at higher intensity.
CP breaks down rapidly during the first few minutes of intense exercise. Decline in muscle power and the onset of fatigue during repeated intense muscle contractions are thought to result from a depletion of muscle CP stores. In food, creatine is found in highest concentration in raw meat and fish. However, it is unstable in the presence of heat, which means that cooking reduces the creatine levels. One would have to consume very large amounts of meat and fish to supply the creatine necessary to maintain energy during intense exercise.