哈西哈西哈西
这里exercise是可数名词，指的是具体系列活动，不是抽象概念。所以用名词复数。
例句：
1、每天做眼保健操对你们的眼睛是有好处的。
To do eye exercises every day is good for your eyes.
2、在做眼保健操时我们应该闭着眼睛。
We should close our eyes when we are doing eyes exercises.
3、老师要求我们认真做眼保健操。
The teacher ask us to do eye exercise carefully.
4、做眼保健操在保护视力方面很有功效。
Doing eye exercises works well in protecting our eyesight.
5、我们做眼保健操来保护视力。
We do the eye exercise to preserve our eyesight.
哆啦Y梦
exercise 作名词时视含义不同，可能可数也可能不可数。活动；运动activity/movements1. [u]（身体或脑力的）活动，锻炼，运动physical or mental activity that you do to stay healthy or become stronger2.[c]（保持健康或培养技能的）一套动作，训练活动，练习a set of movements or activities that you do to stay healthy or develop a skill
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