Hydration is crucial for athletes during competition because it supports optimal physical performance and prevents dehydration-related complications. Adequate fluid intake maintains core temperature, regulates blood volume, and ensures effective muscle contractions. Dehydration can lead to decreased endurance, impaired cognitive function, and increased fatigue, all of which could compromise athletic performance. It is vital for athletes to hydrate before, during, and after competition to replace fluids lost through sweat. Electrolyte balance is also important, as it helps to maintain muscle function and nerve signals, further emphasizing the importance of hydration during intense physical activity.