exercise和exercises的用法：exercise可作名词和动词，当作名词时，意为活动、锻炼、运动、习题等，作动词时，意为行使、使用、训练、操练等；而exercises是exercise的第三人称单数和复数形式，意思与用法与exercise一样。
1、当作为名词时，意为活动，锻炼，运动;训练活动;习题;练习等。复数形式为exercises。
例句：I don't get much exercise sitting in the office all day.
我整天坐在办公室很少运动。
Repeat the exercise ten times on each leg.
每条腿重复做十次这种动作。
Do exercise one for homework.
家庭作业做习题一。
Staying calm was an exercise in self-control.
保持镇定是一种自我控制活动。
2、当作为动词时，意为行使;使用;运用;锻炼;训练;操练;锻炼等。第三人称单数为exercises。
例句：He was a man who exercised considerable influence over people.
他是个对别人有相当影响的人。
Horses need to be exercised regularly.
马需要有规律的训练。
These movements will exercise your arms and shoulders.
这些动作将锻炼你的手臂和肩膀。
1、作为名词时，意为活动，锻炼，运动，训练活动，习题，练习等。
I do special neck and shoulder exercises
我做专门的颈部和肩部运动。
Do these exercises religiously every day.
每天要认真地做这些练习。
2、作为动词时，意为行使;使用;运用;锻炼;训练;操练;锻炼等。
She exercises two or three times a week
她每周锻炼两三次。
Look over exercises before handing them in.
把练习检查一遍再交。
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