| 摘 要： | Life is made up of exercise and activity;but,if life is to continue for any extended time,there must also be rest and relaxation.A bal-ance between activity and rest is the objectiveof all intelligent living-not too much activity,yet not too much rest.Life for most people is a very unbalancedaffair.Jobs in modern industry are so special-ized that usually one part or one set of organsof the body is overstrained while others arealways in need of exereise.Much of the fatigue and strain from thework we do today is the result of unnecessarytension.Every job we do requires that certain
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