During exercise, symptoms of dehydration to watch out for include excessive thirst, dry mouth, fatigue, dizziness, and dark-colored urine. Hydration is crucial for maintaining optimal body function, particularly during physical exertion, as it affects endurance, strength, and overall performance. Athletes and fitness enthusiasts should monitor these signs and take proactive measures to stay hydrated. Consuming fluids before, during, and after exercise can help maintain performance levels and prevent complications associated with dehydration. Staying vigilant about hydration ensures safer and more effective workout sessions.