All from the lack of proper breathing.
Even the nervous system suffers from improper breathing, inasmuch as the brain, the spinal cord, the nerve centers, and the nerves themselves, when improperly nourished by means of the blood, become poor and inefficient instruments for generating, storing and transmitting the nerve currents.

And improperly nourished they will become if sufficient oxygen is not absorbed through the lungs.

There is another aspect of the case whereby the nerve currents themselves, or rather the force from which the nerve currents spring, becomes lessened from want of proper breathing, but this belongs to another phase of the subject which is treated of in other chapters of this book, and our purpose here is to direct your attention to the fact that the mechanism of the nervous system is rendered inefficient as an instrument for conveying nerve force, as the indirect result of a lack of proper breathing.
The effect of the reproductive organs upon the general health is too well known to be discussed at length here, but we may be permitted to say that with the reproductive organs in a weakened condition the entire system feels the reflex action and suffers sympathetically.

The Complete Breath produces a rhythm which is Nature's own plan for keeping this important part of the system in normal condition, and, from the first, it will be noticed that the reproductive functions are strengthened and vitalized, thus, by sympathetic reflex action, giving tone to the whole system.

By this, we do not mean that the lower sex impulses will be aroused; far from it.