STRENGTH OF MUSCLES.
A well-developed man can drag a little less than his own weight over a level surface, while a draught-horse can draw only two-thirds. The horse, therefore, is relatively weaker than man. There are some insects, however, which are able to move nearly fifty times their own weight.
From what you have learned about the importance of exercise, you will understand how necessary it is that every muscle should be trained. In no other way can you preserve sound, rugged health.
HYGIENE OF THE MUSCLES.
When the muscles are properly used, they become large, firm, and dark red in color. Such use of them causes the skin to act freely, while the brain is made vigorous and the digestion improved. It is the best medicine in the world. You must be careful not to strain or overwork your muscles, as it is very hurtful. Your strength must be built up by moderate, careful, and regular exercise.
The muscles need not only exercise to make them strong, but a constant supply of good, pure blood. You must eat wholesome food, in proper quantities, at regular intervals.
You must take plenty of exercise in the sunlight. The blood and the muscles demand the light and the heat of the sun to make them strong.
EFFECTS OF EXERCISE.
The effect of exercise upon the muscles may be clearly seen in the arm of the blacksmith; in the foot and leg of the walker; in the fingers of the pianist; and in the hand and fore-arm of the skillful penman.