Humidity can significantly affect exercise performance by increasing thermal stress on the body. High humidity levels hinder sweat evaporation, which is essential for cooling the body during physical activity. This can lead to increased body temperature, resulting in fatigue, decreased performance, and a higher risk of heat-related illnesses. Athletes may experience reduced endurance and strength as the body struggles to maintain core temperature. To mitigate these effects, individuals should ensure adequate hydration and adjust their workout routines according to weather conditions.