exercise 可数不可数用法

Exercise是一个可数名词和不可数名词。

当它作为可数名词时，它指的是一项或多项体育锻炼或健身活动的单个实例。例如：

• I did three exercises at the gym yesterday.
• The fitness instructor showed us some new exercises to try.

当它作为不可数名词时，它指的是一段时间内的体育锻炼或健身活动的总和。例如：

• Regular exercise is important for overall health and wellbeing.
• She doesn't get enough exercise, so she's feeling lethargic and out of shape.