Your body exists in a state of homeostasis - a complex system of negative loops and hormonal reactions. All it wants to do is to survive. If it has no need to change, it won't. It's also why our body prefer to be fat than muscular! In times of famine your body prefers to consume stored body fat than muscle.

Using weights to build muscle is a way of forcing your body to change. Placing your muscles under a stress they are not accustomed to will cause our body to react by growing to cope with any future stress. The adaptation won't last long though, without continually adding to that stress.

The various exercise plans, such as the 5 x 5, 6 x 6, 10 x 10 rep range, drop sets, rest/paue or German Volume Training etc etc etc are just ways to place your muscles under this unaccustomed stress.

Periodically alternating training systems is just another way to continually add shock or stress your muscles. If we didn't do this, homeostasis would bring our progress to a direct halt and eventually reverse it.

For this reason, it is wise for beginners to start with a basic all over body workout before gradually progressing up the ranks to the much harder 6 x 6 and GVT type of workout. A beginner couldn't possibly use the 6 x 6 style of workout to his advantage.

And let's face it, training would bore us all to tears if every exercise we ever did was exactly the same.

All that would eventually happen if we trained hard and didn't eat the nutrients necessary to support this adaptation is that we would weaken and gradually become ill. It's your body's way of forcing you to stop damaging itself.

The bottom line here is . . . don't get too anal about finding the correct training method, because no single method will work forever anyway!

Just keep stressing and shocking your muscles any way you enjoy. It's far better to get anal about your diet and your rest!