PHYSICAL TRAINING 157 



ear, the muscular sense, the senses of temperature, 

 pressure, touch and equilibrium are trained by the 

 work. The relaxation afforded by games and sport, 

 or even by a change of work, is the natural safe- 

 guard against the nervous breakdown which is too 

 common among civilised men and women, who 

 become slaves to their' work and cultivate their 

 ambition until it becomes an obsession and a vice. 

 The best method of inducing healthy sleep and 

 restoration is muscular fatigue of moderate degree ; 

 muscular exercise or work cannot be performed 

 without nervous activity, but severe mental work is 

 often unaccompanied by muscular activity sufficient 

 to produce those complex chemical changes which 

 accompany healthy fatigue. 



The Digestive System in the healthy man must 

 respond to muscular activity, for the work per- 

 formed is at the expense of the energy supplied by 

 the food. Experience has always shown that men 

 and horses feed best when they are well worked, 

 and work best when they are well fed. Exposure 

 to cold has a similar stimulating effect, for muscular 

 tone and activity are increased in order to produce 

 more heat for the maintenance of the temperature 

 of the body. The man who takes sufficient exercise 

 daily runs no risk of becoming corpulent or over- 

 fed when he eats as much as he desires, and a 

 sturdy growth of children is not to be obtained by 

 the intelligent selection of the quality or quantity 



