Physical exhaustion isn’t simply feeling sore for a few days after a workout. Overtraining is an unusual muscle soreness a person develops if they lack sufficient rest periods and it typically happens after working out consecutively for days or weeks. The potential signs of overtraining include weakened performance, fatigue, poor sleep or mood, extended recovery times, getting sick easily, and a loss of appetite. The best thing to do to avoid overtraining is to give your body enough time to recover between workouts. If you begin developing symptoms, take several days of complete rest from training to give your body time to recover.