THE SCIENCE OF HAPPINESS 



and by giving proper attention to his body to prepare 

 his mind for further conquests. The necessity for this 

 forces itself upon him in a way that leaves no ground for 

 question. The only things to be determined are (i) 

 the degree of development that is to be desired, and 

 (2) the methods by which it may best be secured. 



i. As to the degree of development that will tend to 

 preserve the health of the muscles and other organs, it is, 

 of course, impossible to speak except in general terms. 

 Everyone secures some measure of exercise in the 

 routine of his ordinary life. But very few vocations are 

 calculated to give the various muscles of the body sym- 

 metrical exercise. The Yational thing, of course, is 

 for any individual to exercise perfunctorily those sets of 

 muscles that are not exercised naturally in his ordinary 

 manner of living. For the vast majority of people un- 

 der ordinary conditions of living the muscles that are 

 most slighted are those of the chest and upper extremi- 

 ties. Nearly every one is obliged to walk enough in a 

 day to keep his leg and thigh muscles in a condition 

 of reasonable tonicity. But the average individual 

 has chest and upper-arm muscles that are flabby and 

 undeveloped to the last degree. 



Measurement of a few average arms will at once 

 satisfy anyone of this. There was a time, doubtless, 

 when our ancestors had arms as large as their legs, per- 

 haps even larger. Our remote tree-dwelling relatives 

 have such arms now. But centuries of biped use have 

 developed our lower extremities disproportionately, 

 until now the most fully developed human arm bears 

 no comparison in size to the thigh of the same individual 



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