92 THE HUMAN BODY. 



iarity. It should be borne in mind, however, that the 

 legs especially need strength ; while in the arms delicacy 

 of movement is more important to most persons than 

 great strength ; and the fact that gymnastics are usually 

 practiced indoors is also a great drawback to their value. 

 Out of door exercise in good weather is better than any 

 other, and every one can at least take a walk. The daily 

 " constitutional" is very apt to become wearisome, es- 

 pecially to young persons, and exercise loses half its value 

 if unattended with feelings of mental relaxation and pleas- 

 ure. Active games, for this reason, have a great value for 

 young and healthy persons ; lawn tennis, base ball, and 

 cricket are all attended with pleasurable excitement, and 

 are excellent also as exercising many muscles. 



What is chiefly needed in the muscles of arms and legs respect- 

 ively? Point out conditions under which muscular exercise loses 

 much of its value. Why are athletic games especially useful? 



