What is a potential impact of high stress levels on exercise performance?

High stress levels can significantly impact exercise performance, and one of the primary effects of prolonged stress is muscle breakdown. When the body is under stress, it releases hormones such as cortisol. Elevated cortisol levels can lead to a breakdown of muscle protein, which can diminish strength and performance during exercise. This muscle breakdown can hinder recovery and muscle growth, making it more challenging for individuals to achieve fitness goals. Over time, this can also lead to increased fatigue, decreased motivation, and a higher risk of injury, further compounding the negative effects on overall exercise performance.

The other options do not accurately reflect the potential impacts of high stress on exercise. For instance, high stress is unlikely to enhance efficiency or endurance; in fact, it can lead to decreased physical capacity and overall performance degradation. Therefore, recognizing the link between stress and muscle breakdown is crucial for understanding how mental wellness influences physical activity and athletic performance.