Signs of overtraining syndrome include persistent fatigue, decreased performance, and elevated resting heart rates. Athletes may experience mood swings, irritability, and sleep disturbances as their bodies struggle to recover from intense training. Physical symptoms can manifest as frequent illnesses, chronic muscle soreness, and joint pain, indicating that the body is not adequately recovering. Monitoring training intensity and incorporating rest days are crucial to prevent overtraining. Recognizing these signs early can help athletes adjust their training regimen to ensure optimal performance and health.