exercise是不可数名词。
exercise：
n.活动，锻炼，运动;(保持健康或培养技能的)一套动作，训练活动；
v.行使;使用;运用;锻炼;训练;操练；
第三人称单数： exercises复数： exercises现在分词： exercising过去式： exercised过去分词： exercised
For maximum effect do the exercises every day.
每天锻炼以取得最佳效果。
He was a man who exercised considerable influence over people.
他是个对别人有相当影响的人。
Regular exercise has a direct bearing on fitness and health.
经常性锻炼对于身体健康有直接影响。
Repeat these five steps, as in the last exercise.
照前面的练习一样，重复这五个步骤。
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