我经常做运动用英语怎么说

"I often do exercise" 可以用英语表达为 "I frequently exercise" 或 "I regularly work out"。

"Frequently" 来自拉丁语 "frequentem"，意思是 "常常"。例如：I frequently go to the gym. (我经常去健身房。)
"Regularly" 来自拉丁语 "regularis"，意思是 "有规律地"。例如：I regularly run in the morning. (我早上有规律地跑步。)
"Work out" 是美式英语中的常用说法，意思是 "锻炼"。例如：I work out every day. (我每天锻炼。)