Dehydration adversely affects exercise performance by impairing thermoregulation, reducing stamina, and increasing the risk of injuries. As the body loses fluids, it leads to decreased blood volume, affecting cardiovascular efficiency and muscle function. A dehydrated individual may experience increased fatigue, reduced strength, and slower reaction times. Moreover, cognitive functions decline, affecting focus and decision-making during workouts. Therefore, maintaining proper hydration before, during, and after exercise is essential for sustaining optimal performance and overall health, as well as preventing dehydration-related complications.