Over-Training Counterproductive.
Over-training occurs when you do not allow your body to adjust, adapt, and recuperate from the training regimen you take part in and can be detrimental to realizing your fitness goals. Signs of over-training include decreased performance, increased resting heart rate and blood pressure, increased muscle fatigue, gastro-intestinal problems, depression, irritability, apathy, and low self-esteem. Experts recommend starting slowly with your exercise routine and working with a trainer to assess your fitness level and determine a more personalized training program.
Butler University, January 2010