Air is the substance on which principally we feed. What we eat is of
secondary importance. The purity of the blood and the strength of
the arteries through which it throbs depend absolutely upon right
breathing. The greater the quantity of air taken into the lungs, the
more oxygen for the purification of the blood--the constant and prime
requirement for health.
The system of breathing which I advocate in this work is not a mere
matter of theory, something vague and experimental. It is concrete; it
is exact; its worth has been definitely proved. I have demonstrated
the merit of the exercises in my own case. During a year and a half
of practice my chest measurement increased from thirty-eight inches to
forty-two.