Open the left hand with the fingers together but the thumb out of the way. Move the index finger so that the tip of it circles around down toward the palm, over to the thumb, to the back, and returns to the original position. Keep the fingers straight all of the time. Repeat this without muscular resistance five times.
Now stiffen the muscles of the finger, so that one set resists this motion, while the other set overcoming the resistance, causes the finger to circle as before. Repeat five times.
Go through the same exercise with each of the other fingers of the left hand, and then with all of the fingers of the right hand.
EXERCISE 23.
Extend the fingers of the left hand, with the little finger away from you and the thumb opened and pointing away from the palm, that is toward your right. Bring the index finger down until it is at right angles to the palm, bending only at the knuckle joint.
Let the knuckle joint straighten up again and at the same time bend the other two joints of the finger, so that the finger tip goes down to the palm of your hand. Repeat this exercise five times without resistance, and then five times with resistance.
Continue the exercise of each finger of the left and right hands.