Many of those who start a muscle building program tend to over train their muscles because a newbie always thinks that more is better.
It is important that you understand that in order to gain muscles fast and health it is important you respect that resting times you have to take between reps and the amount of lifting you do in one day.
If you over train your muscles you can experience numerous health risks such and even lose muscle mass! A couple of symptoms of over training are high blood pressure, insomnia, emotionally unstable, lack of appetite and losing muscle mass.
Long term effects are even worse; overtraining your muscles can cause a decrease in testosterone levels, decrease in cortisol levels and thyroxine levels as well.
If you over train you will not see an increase of muscle and might think that you need to take more supplements and eventually just get the wrong nutrition and never reach your muscle building goal.
The best way to prevent overtraining is to set up a healthy muscle building workout that you will follow no matter what. Respect the resting times between exercises; remember that your muscles need to fully recover in order gain more muscle mass.
Also keep a healthy diet in order to feed your muscles correctly and give you the energy you need