Working out in heat significantly increases hydration needs due to higher perspiration rates. As the body temperature rises during exercise, the body produces more sweat to cool itself, leading to fluid loss. This loss can cause dehydration, which may impair performance and increase the risk of heat-related illnesses. Therefore, individuals exercising in hot conditions should consume additional fluids before, during, and after workouts. Monitoring urine color can also be an effective way to gauge hydration status to ensure optimal performance and safety during exercise sessions in the heat.