Over the counter performance enhancing drugs have become very popular over the past decade. They are easily available to the public due to stores such as GNC. No prescription is needed so anyone can buy them. They are commonly known as supplements or substances. At the high school level supplements are common as well as the professional level. Pre or post workout drinks are found in locker rooms across the nation. The supplement most regularly seen is creatine, which has not been banned in any committee. Supplements such as creatine allow athletes to increase power output and delay fatigue. It works by giving the muscle more phosphocreatine storage, which gives the muscle energy to do quick explosive movements. This would appear to be beneficial during training for anaerobic events. Creatine is also believed to be associated with water retention, which would appear as if it were muscle mass.