Creatine not only improves physical performance but also reduces mental fatigue and improves mental performance. Creatine helps make more "fuel" available to the muscle in the form of ATP. This extra fuel ensures that the muscle works faster and longer and recovers faster after intense exercise or sustained physical activity. This also means that there is less muscle soreness and enhanced endurance. Numerous studies support the use of creatine for increasing endurance, building muscle mass and improving athletic performance. Creatine is, however, more than just an ergogenic nutrient: It has a voluminizing effect on the muscle. Cell voluminizing, or cellular hydration, involves binding of water to the muscle fiber. In turn, this binding gives rise to the "pumped" look. Since water is bound inside the muscle, the athletes using creatine do not have the "puffy" appearance. In other words, the muscle looks larger but more importantly, has improved strength and has high energy and intensity. That allows the athlete to recover faster and have more energy for each training session.