A common symptom of dehydration during exercise is an increased sensation of thirst. Additionally, athletes may experience reduced physical performance, fatigue, dizziness, and dark-colored urine. Dehydration occurs when fluid loss exceeds intake and can lead to serious health risks if not addressed. Other signs include headache, dry mouth, and increased heart rate. Maintaining adequate hydration is paramount for optimal performance and recovery, as water helps regulate body temperature and supports various physiological functions. Regular hydration breaks, especially during intense activities, can help prevent dehydration.