Overtraining
Training beyond the body's ability to repair itself. This can be caused by training the same body parts too frequently so that the body does not have time to recover before the next workout; workouts that are consistently harder than the body is able to recover from fully; or impairment of the body's normal recovery ability due to nutritional deficiencies, illness, or stress. Besides impairing athletic performance, overtraining can increase the risk of injury or disease. Symptoms of overtraining include fatigue, reduced performance, and increased resting heart rate.