It is the combination that produces the most effective results.
[Illustration: EFFECT OF THIRTY DAYS OF TRAINING UPON A COMPANY.

THESE MEN ARE CARRYING IRON BARS WEIGHING NINE POUNDS EACH] [Illustration: PRACTISING AND MARCHING WITH IRON BARS WEIGHING NINE POUNDS EACH] In a group the leader constantly cautions the men as to carelessness or slackness.

The individual having no leader must always keep his mind fixed upon the exact way in which his exercises should be performed.
When he puts his hands behind his head in "Neck Firm" or "Head" he must keep his elbows back and his head up, while the chest should be arched.
When he bends forward in the prone position he must not allow his head to droop.

When he raises his knees in alternate motions he must bring his knees well up.

When he does the exercise of leaning up against the wall, by means of the extended arm and hand, he must keep the distance far enough from the wall to bring about a certain amount of real effort by the hand, arm, and shoulder.