Signs of overtraining in athletes may include prolonged fatigue, decreased performance, and increased susceptibility to injuries. Other indications include irritability, sleep disturbances, and changes in appetite or weight. Athletes might experience a lack of motivation and enjoyment in their training, leading to burnout. Physiologically, metrics such as resting heart rate abnormalities and elevated levels of cortisol can suggest overtraining. Awareness of these signs is vital for timely recovery and to prevent long-term consequences on athletic performance.