Signs and symptoms of dehydration during physical activity can include increased thirst, dry mouth, fatigue, dizziness, and dark-colored urine. More severe signs may manifest as confusion, rapid heartbeat, or extreme weakness. When engaging in exercise, especially in hot or humid conditions, staying hydrated is essential for maintaining performance and preventing heat-related illnesses. It is advisable to drink fluids before, during, and after physical activity. Monitoring hydration status through urine color can help individuals ensure they are adequately hydrated, ultimately supporting better athletic performance and overall health.