. First book in physiology and hygiene . o ^ slide to thehome plate. Learning to swim or skate takes grit. Bicycling is good exercise, chiefly because it hasto be taken out of doors. There is danger of over-taxing the heart if one rides too far or too is a fine game, suitable for girls as well asboys. It develops every muscle of the body. Foot-ball is a game of brains as well as muscle. But foot-ball should not be played by young, undeveloped,untrained boys, for the same reason that very littlechildren should not climb trees. There is great riskof being crippled for life in either
. First book in physiology and hygiene . o ^ slide to thehome plate. Learning to swim or skate takes grit. Bicycling is good exercise, chiefly because it hasto be taken out of doors. There is danger of over-taxing the heart if one rides too far or too is a fine game, suitable for girls as well asboys. It develops every muscle of the body. Foot-ball is a game of brains as well as muscle. But foot-ball should not be played by young, undeveloped,untrained boys, for the same reason that very littlechildren should not climb trees. There is great riskof being crippled for life in either case. Walking is one of the best and most naturalforms of exercise. Walk erect, knees straight, headwell up, chin in, eyes to the front, looking the worldin the face. Running and jumping also are healthfulto those for whom they are not too violent. By all means learn to use tools. You will begetting exercise and knowledge at the same time. — 133 —XLIL—A PICTURE LESSON. Write a description of a football game that you mar have XLIII.—REST. The Need of Rest.—If you take a long walk, orstand a long time to watch a parade, your legs andfeet will become very tired. But you could sitdown afterwards and enjoy sewing or using tools orpractising on the piano; for you would be restingthe tired muscles of your feet and legs and using afresh set of muscles—those of your hands and arms. If you use any muscles too long, they not onlybecome very tired, they also grow weaker. Theywear away faster than they can be repaired by theblood. The children who quit school and do heavywork in a store, a factory, a mill, or a mine, donot grow to their full size or strength. And onereason is that thev overwork; their muscles be-come very tired, and their growth is slow. How to Rest.—If any muscles have been exerciseduntil they are a little tired, they should be we need not be idle to be resting. We can restone part of our bodies while we use another the mind is tired
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