"He exercised over the weekend" 意思是他周末锻炼了。

"Exercise" 是动词，意思是进行体育锻炼或身体活动。这个词源于拉丁语 "exercitare"，意思是训练，操练。

例句：

I try to exercise at least three times a week. (我尽量每周至少锻炼三次。)
He exercises to stay fit and healthy. (他锻炼以保持健康。)
She enjoys exercising outdoors, especially running and cycpng. (她喜欢户外锻炼，尤其是跑步和骑自行车。)

"Over the weekend" 意思是在周末。"Weekend" 指的是周六和周日。

例句：

I usually relax and do some fun activities over the weekend. (我通常在周末休息并做一些有趣的活动。)
He visited his parents over the weekend. (他在周末拜访了他的父母。)
We're planning a trip to the beach over the weekend. (我们计划在周末去海滩。)