Which of the following is NOT a sign of overtraining?

Enhanced performance is indeed not a sign of overtraining. In fact, overtraining typically results in diminished performance, rather than enhancement. When an athlete undergoes excessive training without adequate recovery, the body's ability to respond positively to training diminishes, leading to a variety of negative effects.

Signs of overtraining commonly include increased injury risk due to the body's inability to properly recover, heightened fatigue as energy levels deplete, and prolonged recovery times as the body struggles to bounce back after workouts. Therefore, the presence of enhanced performance among these indicators highlights a clear deviation from the physiological responses associated with overtraining. In summary, enhanced performance is an indication of effective training and adaptation rather than a symptom of overtraining.