To trigger a maximum muscle increase you have to train the maximum of muscle fibres with a maximum of intensity.

What does that mean in coherence with real training?

At the beginning of each training career you make good progresses with every kind of training method.
Endurance power athletes who worked a lot with their legs can develop them very fast and nice .

Other body parts do not develop like they want them to, no matter how they train them.

How come?

Although their legs aren’t really big, they become muscular much faster than the rest of their body.

The answer is easy, maybe you already know it..

Because of the permanent leg-load they activate a lot of muscle fibres. During the exercises they could stimulate more of them.

Now I am going to have a look at the pump effect.