exercise读音：[ˈeksəsaɪz]

n.(身体或脑力的) 活动，锻炼，运动; (保持健康或培养技能的) 一套动作，训练活动; 习题; 练习;

例：

Swimming is good exercise.

Exercise is a good safety valve for the tension that builds up at work.

锻炼身体是排解工作压力的好办法。

Exercise will not only lower blood pressure but possibly protect against heart attacks.