But the bodybuilding magazines say to split up my program into 5 seperate days... Yes, I am more than familiar. I call these 5 day splits 'drug programs.' They treat your body simply as a 'muscular system' and neglect the other systems such as your Central Nervous System, hormonal system and immune system. Each of these systems have a unique part in muscle growth. Not to mention that these 'drug programs' only work if coupled with a few thousand dollars a month on drugs.

Just because you trained your chest on Monday does not mean your immune system, or hormonal system or central nervous system has FULLY recovered. What happens when you return to the gyn NOT FULLY recovered? Will you be able to lift more weight?

If you are not able to lift more weight than guess what happens to your level of fitness? It certainly will not go up because you will be depleting your energy reserves further into a deep, dark hole called 'over-training.' If you can not lift more weight or 'out-do' yourself from your previous workout than how do you expect to create any NEW muscle? It is literally impossible. Taking a full rest day every two days will minimize the chance of overtraining and ensure your energy reserves are replenished.