The injunction “Know thyself” was inscribed in letters of gold over
the portico of the temple of Delphi. We can know ourselves only by
thoughtful observation and reflection. General forms of exercise may be
presented, but we must consider whether our present health and physical
condition will not require some modification of the prescribed forms.
Certain modes of bathing and specific rules for diet and sleep may be
good for the multitude and yet unsuited to particular individuals.
Any marked change from our accustomed manner of life should begin
gradually. For one who, in winter, has never taken any other than a
warm or tepid bath, to plunge suddenly and without preparation into
a tub of cold water might be attended with serious results, while by
gradual stages the same point may be reached with positive advantage to
health and comfort.
The popular error still prevails that a well equipped gymnasium and
costly apparatus are necessary to healthful physical development. It is
an important part of the object of this work to show that with little
or no outlay for apparatus, and with the expenditure of very little
time, both health and vigor may be secured and preserved, and the
success and happiness of life be greatly promoted.
The hindrances to a more general adoption of a course of physical
training as a means of promoting health and strength are: