Poor hydration can significantly impair exercise performance. Dehydration leads to decreased endurance, reduced strength, and impaired cognitive function. When fluid levels drop, the body struggles to regulate temperature, leading to an increased risk of heat-related illnesses. Additionally, hydration status affects muscle recovery and joint lubrication, making workouts less effective and more risky. Athletes should monitor their fluid intake before, during, and after exercise to maintain optimal performance levels and support overall health.