When marching in double time and in running the men breathe as much as possible through the nose, keeping the mouth closed.
A few minutes at the beginning of the setting-up exercises should be devoted to double timing. From lasting only a few minutes at the start it may be gradually increased, so that daily drills should enable the men at the end of five or six months to double time 15 or 20 minutes without becoming fatigued or distressed.
After the double time the men should be marched for several minutes at quick time; after this the instructor should command:
1. Route step, 2. MARCH.
In marching at route step, the men are not required to preserve silence nor keep the step; if marching at proved intervals, the latter is preserved.
To resume the cadence step in quick time, the instructor commands: 1. Squad, 2. ATTENTION.
Great care must be exercised concerning the duration of the double time and the speed and duration of the run. The demands made Upon the men should be increased gradually.
When exercise rather than distance is desired, the running should be done on the balls of the feet, heels raised from the ground.
Double Timing Exercises