How does humidity primarily affect physical exercise?

Humidity primarily affects physical exercise by increasing the risk of overheating. When the humidity level is high, the body's ability to cool itself through sweat evaporation is compromised. In humid conditions, sweat does not evaporate as efficiently, leading to a reduction in the body's cooling mechanisms. As core body temperature rises, there is an increased risk of heat-related illnesses, such as heat exhaustion or heat stroke, which can negatively impact performance and safety during exercise.

The combination of high temperatures and humidity makes it difficult for the body to regulate its internal temperature, which can lead to fatigue, decreased performance, and increased discomfort during physical activity. Understanding the impact of humidity on exercise is essential for athletes and fitness enthusiasts as it allows them to take necessary precautions, such as hydration strategies or adjusting workout intensity, to mitigate the effects of heat stress.