Over-Training

Personally I feel that I might over train after reading up about it. I learned training too much, or at too high of an intensity will lead to over-training.
Whether you are a bodybuilder, athlete, or just someone that wants to add some additional mass to your frame, you need to train hard and be consistent-that’s a given. In order to get the most out of your genetics, you have to progressively overload the muscles by increasing the weight and / or intensity of each weight training workout.
The problem is however, that many of us increase the intensity of our workouts or get insufficient amounts of rest, or even worse, a combination of both. The trick is finding the right balance between workout volume and intensity, and rest and recovery.
Has your physical performance improved compared to your last workout?
For example, let’s say last workout you were able to perform 8 pull-ups using your body-weight, but were only able to perform 6 pull-ups the following week.  This means that you have not “out done” your previous workout, have not fully recovered, and therefore are likely over-training.  You have to re-asses your program and make modifications so that you see progress every workout.
How to Prevent Over-training?
In order to avoid over-training, you need to take a multi-facited approach.  Determining the correct training volume and intensity, eating the right foods, and getting the right amount of rest and recovery must all be taken in to consideration.  
Rest and recovery is essential when it comes to avoiding over-training.  Make sure that you get at least 7 hours of sleep each night, and that you are on a consistent schedule. As for recovery time, it's important that you have days off between weight training workouts. Try to have on rest day between weight training workouts, and never train the same muscle groups on consecutive days.