Which of the following is a sign of overtraining?

Decreased performance is a prominent sign of overtraining. Overtraining occurs when an individual exceeds their body's ability to recover from prolonged and intense exercise sessions. Instead of making progress or experiencing increased strength or improved performance, the individual may find their overall athletic performance declining. This can manifest as slower times, reduced strength levels, decreased endurance, or an inability to complete workouts that were previously manageable. The body becomes fatigued without adequate recovery, leading to symptoms that include systemic fatigue, irritability, sleep disturbances, and, notably, a drop in performance.

In contrast, increased strength and plenty of energy would indicate effective training and recovery, while improved mood generally reflects a well-managed training regimen, free from the stress and strain associated with overtraining.