EXERCISE. 191 



Exercise. 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 ex- 

 ercise to develop muscle, to reduce fat, and to maintain 

 health, experience also teaches us that tissue, which 

 is formed under conditions of rapid waste and repair, 

 is stronger and of better quality than that subjected to 

 more gradual change; while 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, by which means an increased supply of 

 oxygen is absorbed into the vital fluid for the oxidiza- 

 tion of effete matters contained in it. 



By quickening the circulation, it stimulates the pro- 

 cesses 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 within certain limits 

 only the muscles which are used in galloping may be 

 specially developed, for were other muscles also called 

 into abnormal play, their extra nutrition would but tend 

 to deprive the muscles used in galloping of material for 

 repair, and would add unnecessary weight to be carried. 



