CHAPTER VII.
We may now consider the question of time-saving for those who may be obliged to largely forego pleasurable exercise and who yet desire to keep fit and well in spite of this deprivation.
There are two divisions in this class, as may be shown in the case of the present world war.

The first class embraces all the men in active service, with two subdivisions--officers who are over forty and officers and privates who are under that age.

The second class comprises the men (and women, too, for that matter) who, unable to do service at the front, must support the troops in various ways behind the lines.

It is said that it takes five men behind the line to support one man at the front, and, judging from the pressure that already has come upon our people, this is manifestly not an incorrect statement.

These reserves must be kept in good physical condition, and with this end in view the writer has prepared a modified form of setting-up exercises which has been tested out with large numbers in actual practice.
These exercises are intended to prepare the younger men for the more strenuous training which they are to undergo later; in the case of the older men, they are to be used before entering upon the ordinary day of business routine.