What is a common sign of dehydration during exercise?

A common sign of dehydration during exercise is indeed thirst or dark-colored urine. Thirst is the body's natural signal indicating that it needs more fluids, and it often becomes noticeable when dehydration sets in. Dark-colored urine is another key indicator; when the body is dehydrated, urine typically becomes more concentrated and darker, reflecting that the kidneys are conserving water due to a low availability of fluids.

Recognizing these signs is crucial for athletes and individuals exercising, as they highlight the importance of maintaining hydration for optimal performance and health. Monitoring both thirst levels and urine color can help individuals adjust their fluid intake during physical activity to prevent negative effects associated with dehydration, such as reduced stamina and increased risk of heat-related illnesses.