Besides fresh air, another important thing in keeping well is to eat slowly and to chew your food thoroughly. Boys and girls often develop a habit of rapid eating because they are anxious to get back to play or to school. Slow eating is largely a matter of habit as well, and while it may seem hard at first it will soon become second nature to us. Remember to chew your food thoroughly. The stomach has no teeth. We have all heard of Mr. Horace Fletcher, that wonderful old man who made himself young again by chewing his food. There is no fun in life unless we are well, and a sensible boy should realize that his parents’ interest in him is for his own benefit. It may seem hard sometimes to be obliged to do without things that we want, but as a rule the judgment of the older people is better than our own. A growing boy will often eat too much candy or too many sweet things and then suffer from his lack of judgment. To fill our stomachs with indigestible food is just as foolish as it would be to put sand in the bearings of our wheel, or to interfere with the delicate adjustment of our watch until it refuses to keep time. While we play, our muscles are developed, our lungs filled with fresh air and the whole body is made stronger and more vigorous. Some boys play too hard. Over-exertion will sometimes cause a strain on the delicate machinery of the body that will be very serious in after life. The heart is especially subject to the dangers of overstrain in growing boys. We are not all equally strong, and it is no discredit to a boy that he cannot run as far or lift as much as some of his playmates or companions. You all remember the fable of the frog who tried to make himself as big as the ox and finally burst. The idea of exercise is not to try to excel every one in what you do, but to do your best without overexertion. If a boy has a rugged frame and well developed muscles, it is perfectly natural that he should be superior in most sports to a boy that is delicate or undersized. To be in good physical condition and to laugh at the doctor we must keep out of doors as much as possible. Gymnasium work of course will help us to build up our strength and develop our muscles, but skill in various acrobatics and gymnastic tricks does not give the clear eye and ruddy cheek of the person whose life is in the open air. Outdoor sports, like tennis, baseball, and horseback riding are far superior to chest-weights or Indian clubs as a means of obtaining normal permanent development. Parents who criticize school or college athletics often forget that the observance of the strict rules of training required from every member of a team is the very best way to keep a boy healthy in mind and body.