Which of the following is a sports-specific risk factor for hypohydration?

The correct choice highlights weight divisions as a sports-specific risk factor for hypohydration. In many sports, particularly combat sports like boxing or wrestling, athletes often compete in specific weight classes. To qualify for these divisions, they may engage in weight-cutting practices that can lead to significant water loss and an increased risk of dehydration or hypohydration.

Athletes aiming to make weight might restrict fluid intake in a short period or sweat excessively through practices such as sauna sessions, which can lead to an imbalance in hydration levels. This is particularly critical in sports where performance is closely linked to weight, as hypohydration can severely affect an athlete's ability to perform, leading to reduced endurance, impaired decision-making, and potentially dangerous health effects.

In contrast, the other factors, while they may influence hydration status, are not as directly tied to the competitive demands or strategies associated with specific sports. Age and genetic predisposition may affect an individual's general hydration needs or responses, but they do not uniquely relate to the competitive pressures of a sport. Training intensity can influence hydration needs but does not carry the same specificity to weight-based sports where hypohydration risk is closely tied to weight management practices.