If there is congestion in the region of the throat, the pivotal action of the head is important, but the hands can be made to do a great deal of work also during the pivotal actions. Such manipulation is one of the best remedies for sore throat, and also for dizziness, unless the dizziness is caused by a wrong condition of the stomach or liver, in which case the pivotal actions of the torso should be vigorously performed, with kneading by the hands, of the abdomen. If one limb is weaker than its mate it should be given more practice until balance is restored. If there is any muscle weak in any part of the body, we should find an exercise to strengthen it harmoniously. It can hardly be emphasized too often that the central muscles should be stronger than the surface muscles. Whenever we find, for example, a weak diaphragm, we should use a greater number of exercises for it and be careful not to give too much attention to the arm muscles. It is not mere strength to lift a heavy weight that measures the degree of vitality or indicates length of life, but rather the harmony of all parts working together. The muscles connected with breathing should be stronger in proportion than the superficial muscles of the arms or lower limbs. People who perform one particular movement a great deal, such as a blacksmith in hammering, should study and use exercises for the parts that are habitually neglected. A little thought can correct every abnormal condition, even stiff joints and headache. By practicing patiently such tendencies may be practically eliminated. 13. Practice progressively. Exercises are often taken intemperately. The student begins with enthusiasm, feels uncomfortable results from the extravagance, and then gives up the exercises. Begin carefully. Patiently practice the movement at first ten or twenty times, counting four with each step and accentuating the stretches, each day increasing a little, and after a week or two the results will be surprising. Let there be regularity even in the increasing of the exercises. We must take steps slowly, and gradually add others until we have the number which the normal condition of our system demands. Study your own strength and the effects of the exercises upon you. There are many ways by which an exercise may be made progressive. First, by gradually increasing the vigor of the movement. For example, lifting the feet from the bed, one foot may be lifted at a time, which is easier, or both may be lifted only a few inches at first. Second, the exercise may be performed more slowly and more vigorously. Third, by repeating the exercise a greater number of times. Fourth, by the addition of a greater number and variety of exercises.