Just how much exercise a person of a given age can safely take is a question hard to____(57)．Individual variability is too great to permit generalization．A game of tennis may be perfectly safe for one person of forty but folly(愚蠢)for another．The safe______(58)for exercise depends on the condition of the heart，the condition of the muscles，the______(59)of exercise，and the regularity with which it is taken．Two general suggestions，however，will____(60)as sound advice for anyone．The first is that the____(61)of the heart and general health should be determined periodically by careful，thorough physical examinations． The other is that exercise should be kept____(62)the point of physical exhaustion．

What type of exercise one should____(63)depends upon ones physical condition． Young people Can safely enjoy competitive sports，but most older persons do better to limit themselves to less strenuous____(64)．Walking，swimming and skating are among the spots that one Can enjoy and safely____(65) in throughout life．Regularity is important if one is to get the most enjoyment and benefit out of exercise．

根据以上内容，回答51-65题。

A．improves

B．damages

C．enjoys

D．provides

52、

A．where

B．which

C．when

D．why

53、

A．playing

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