A sign of physical overexertion can manifest as excessive fatigue, persistent muscle soreness, or a decline in performance levels despite maintaining a training regimen. Other indicators include irritability, disrupted sleep patterns, and increased susceptibility to injuries or illnesses. Overexertion often occurs when individuals push beyond their body's recovery capabilities without adequate rest or nutrition. Listening to one's body, allowing rest days, and adjusting workout intensity are crucial for preventing overtraining syndromes and maintaining overall fitness.