Thus the motive power of the body will seem to be gradually drawn to an imaginary centre in the lower part of the trunk,--which simply means withdrawing superfluous tension from every part. The exercise to help establish this equilibrium is graceful, and not difficult if we take it quietly and easily, using the mind to hold a balance without effort. Raise the right arm diagonally forward, the left leg diagonally back,--the arm must be high up, the foot just off the floor, so that as far as possible you make a direct line from the wrist to the ankle; in this attitude stretch all muscles across the body from left to right slowly and steadily, then relax quite as slowly. Now, be sure your arm and leg are free from all tension, and swing them very slowly, as if they were one piece, to as nearly a horizontal position as they can reach; then slowly pivot round until you bring your arm diagonally back and your leg diagonally forward; still horizontal, pivot again to the starting point; then bring leg down and arm up, always keeping them as in a line, until your foot is again off the floor; then slowly lower your arm and let your foot rest on the floor so that gradually your whole weight rests on that leg, and the other is free to swing up and pivot with the opposite arm. All this must be done slowly and without strain of any kind. The motions which follow in sets are for the better daily working of the body, as well as to establish its freedom. The first set is called the "Big Rhythms," because it takes mainly the rhythmic movement of the larger muscles of the body, and is meant, through movements taken on one foot, to give a true balance in the poise of the body as well as to make habitual the natural co-ordination in the action of all the larger muscles. It is like practising a series of big musical chords to accustom our ears to their harmonies. The second set, named the "Little Rhythms,"--because that is a convenient way of designating it,--is a series meant to include the movement of all the smaller muscles as well as the large ones, and is carried out even to the fingers. The third set is for spring and rapid motion, especially in joints of arms and legs.