首先我们来看下exercise和exercises的大致意思：
exercise：词性为名词，A physical or mental activity that is done to keep the body healthy or to help a particular skill
exercises：词性为名词，A series of physical or mental activities done to keep the body healthy or to help a particular skill
通过下面的表格我们了解下exercise和exercises的含义、发音和用法
接下来让我们看下exercise和exercises的用法区别：
1.词形：exercise为单数形式，exercises为复数形式
例子：
- I do exercise every day.
(我每天做一次运动。)
- We need to do some exercises.
(我们需要做一些锻炼活动。)
2.指向：exercise指代一个具体的锻炼活动，exercises指代一个连续的锻炼活动序列
例子：
- I do the same exercise every day.
(我每天都做同一种运动。)
- We participated in an hour of exercises.
(我们参加了一个小时的锻炼课程。)
3.用法：exercise通常用作不可数名词，exercises通常用作可数名词
例子：
- Exercise is important.
(锻炼是重要的。)
- We did five exercises.
(我们做了五个锻炼活动。)
4.复数形式：exercises可以表示多个不同种类的锻炼活动，而exercise通常指特定的某一种
例子：
- Swimming, running, and yoga are all good exercises.
(游泳、跑步和瑜伽都是很好的锻炼活动。)
- You can try some exercises for the whole body.
(你可以尝试一些全身锻炼。)
5.语法：exercise作为不可数名词时，不能与复数形式的动词连用；exercises作为可数名词时，可以与复数形式的动词连用
例子：
- I need to do more exercise.
(我需要做更多的运动。)
- We are doing some aerobic exercises.
(我们正在做一些有氧运动。)