"Exercise" 是英语中表示"活动"的常用词。它来自拉丁语 "exercitare"，意为"训练，练习"。

例句：

I need to do some exercises to stay fit.
我需要做一些活动来保持健康。
She enjoys doing yoga as a form of exercise.
她喜欢做瑜伽作为一种锻炼方式。
Regular exercise is essential for a healthy pfestyle.
定期锻炼对健康生活至关重要。