I. n. [U]為了健康

>I would use some exercise.

>The caoch suggested me to do exercise at least 30 minutes a day.

>Most people don't get enough exercise sitting at a desk all day like this.

II. n. [C]一些特定動作

>The doctor gave me some exercises to help with my back.

III. n.[C]獲得技能

>The piano teacher shared finger exercises to help improve beginners' skills.

IV. n.[C]作業練習題

>Please do exercises 1 and 2 on page 10 for homework.