Relative humidity levels can significantly impact workout performance. High humidity can hinder the body's ability to cool itself through sweat evaporation; this can lead to overheating and cause fatigue more rapidly. In contrast, excessively low humidity may result in increased water loss through breathing, leading to dehydration. Athletes should be mindful of these conditions and may need to adjust their hydration strategies accordingly, ensuring they drink sufficient fluids before, during, and after workouts. Adapting training intensity and duration based on humidity can help maintain optimal performance levels.