This "knack" of sending the mind to the desired part is easily acquired. All that is necessary is to accept as a fact the statement that it can be done, thus doing away with all sub-conscious resistance, occasioned by the doubting mental attitude; then simply command the mind to send a supply of prana to the part, and to increase the circulation there. The mind does this to a certain extent, involuntarily, the moment that the attention is centred on a part of the body, but the effect is greatly increased by the effort of the will. Now, it is not necessary to contract the brows, clench the fist, or to make a violent physical effort in order to operate the Will in this way. In fact, the simplest way to accomplish the desired result is to confidently expect that what you wish will happen. This "confident expectation" acts practically as a strong and positive command of the Will—put it into operation and the thing is accomplished.
For instance, if you wish to send an increased amount of prana to the forearm, and to increase the circulation to that part, thereby increasing the nourishment, simply double the arm, and then gradually extend it, fastening the gaze or attention upon the lower arm, and holding the thought of the desired result. Do this several times, and you will feel that the forearm has been greatly exercised, although you have used no violent motion, and have used no apparatus. Try this plan on several parts of the body, making some muscular motion in order to get the attention there, and you will soon acquire the knack, so that when you go through any ordinary simple exercise you will do this almost automatically.
