Overtraining

I have decided to take the next 3 days off from the gym. I am feeling a bit tired and my body has no energy. I feel as if I am over training. I have been going at it quite hard and heavy the past few months. I am still recovering from an injury but I have still been pushing the limits of reps and weight allowed by my lower back. I support my lower back in all exercises whether it is with the use of a machine or a belt, this does allow me to maximize my time in the gym.

This article from Brian Mac on over training is a good one to read.
http://www.brianmac.co.uk/overtrn.htm
Here is a snippet from his article

"Signs of Over-training
Symptoms indicating over exertion can be classified in the following way:
Movement coordination symptoms:
Increased incidence of disturbances in movement (the re-appearance of faults that seemed to have been overcome, cramp, inhibitions, insecurity)
Disturbances in rhythm and flow of movement
Lack of ability to concentrate
Reduced power of differentiation and correction
Condition symptoms:
Diminished powers of endurance, strength, speed. Increase in recovery time, loss of 'sparkle' (competitive qualities)
Reduced readiness for action, fear of competition, giving-up in face of difficult situations, especially at the finish
Confusion in competition, departure from usual tactics
Susceptibility to demoralising influences before and during competition
Increasing tendency to abandon the struggle
Psychological symptoms:
Increased irritability, obstinacy, tendency to hysteria, grumbling, defiance, increased quarrelsomeness, avoidance of contact with coach and colleagues
Over sensitivity to criticism, or increasing indolence, poor incentive, dullness, hallucination, anxiety, depression, melancholy, insecurity "

Good article Brian
The bottom line as with anything in training is to watch and listen to your body. Become intimate with how it responds to training and you can avoid unnecessary time off.