NATUEE OF EXEECISE. 149 



feeding ; should afford him the rest indispensable for 

 the repair of tissue, and should preserve around him 

 the conditions that are most conducive to health. 



Effect of Exercise on the System. The 

 various tissues of the body have but a limited time for 

 existence, which period is directly influenced by the 

 amount of exercise taken by the animal. Apart from 

 the necessity there is for exercise to develop muscle, 

 to reduce fat, and to maintain health, experience also 

 teaches us that tissue which is formed under condi- 

 tions of rapid waste and repair, is stronger and of 

 better quality than that subjected to more gradual 

 change ; and anatomical investigation proves that the 

 former, from being more vascular, is redder and 

 healthier-looking than the latter. Hence, to improve 

 the quality of the muscular and nervous tissues, we 

 should give as much exercise as is compatible with the 

 individual capabilities of the animal trained. 



Exercise purifies the blood, by quickening the action 

 of the lungs, which supply oxygen to the vital fluid for 

 the breaking up of effete matters contained in it. By 

 quickening the circulation, it stimulates the processes 

 of nutrition for the building up of new tissue ; and, of 

 excretion, for the removal of effete and deleterious 

 substances. It also strengthens the action of the 

 heart and lungs. 



Nature of Exercise. We may conclude that 

 this should gradually conform to that of the race for 

 which the animal is being trained, so that, speaking 

 generally, only the muscles which are particularly used 

 in galloping may be specially developed ; for, were 

 other muscles, also, called into abnormal play, their 



