and legs."

How can you make your muscles strong?--"By using them."

How can you make your muscles weak?--"By not using them."

What is necessary to make your muscles strong and healthy?--"They must be
used; they must be rested when tired; they must be supplied with pure
blood."

How should the muscles be used?--"They should be exercised in work or
play."

How may they be rested?--"I may rest my muscles by changing position; by
changing my kind of work or play; or by going to sleep."

Explain what you mean by changing your position.--"If I am standing, I must
sit or lie down to rest them; if they are tired, because I have been
sitting too long, I must rest them by standing, walking, or running."

What do you mean by changing the kind of work or play?--"If, in my work or
play, my arms become tired, I must do something in which my arms may rest,
though other parts of my body may be in exercise."

How may you help supply your muscles with good blood?--"By breathing pure
air; by taking wholesome food and drink; and by living in the sunlight."

How does drinking alcoholic liquors hurt the muscles?--"It makes them weak,
and unfit to move the parts of the body."