1 68 



GOOD HEALTH 



Muscle that is used also tends to grow larger. It is 

 interesting to measure the size of one's arm at the 

 beginning of a year and then again at the end of the 



year, and see how much it 

 has grown in size, if exercise 

 has been taken. 



Much more important, 

 however, than either growth 

 in hardness or size is growth 

 in strength. If you take 

 hold of a bar that is fastened 

 as high as you can reach 

 and pull your body up so 

 that your chin is over the 

 bar, the muscles of your 



HE STRENGTHENS HIS ARMS 



arms and certain muscles of 

 the back are doing hard 

 work. A boy who can do 

 this but once at the begin- 

 ning of the term can easily, 

 at the end of the term, if he will practice three or four 

 minutes night and morning, do it five or six times. It 

 is not worth while to do it for more than this length of 

 time, for there is no advantage in having arms that are 

 strong unduly in proportion to the rest of the body. 



That which happens to the muscles of the arm when 

 they are used in this way happens to all other muscles 



