Signs that someone is overtraining include persistent fatigue, decreased performance, and increased irritability or mood swings. Other symptoms may include disrupted sleep, elevated resting heart rate, and a higher frequency of injuries or illness. Individuals may also experience a lack of motivation to train and diminished enthusiasm for activities they once enjoyed. If these signs occur, it’s essential to take a step back, allow for recovery, and reassess training intensity and volume to prevent further physical and mental fatigue.