work out：v. 做出；可以解决；设计出；计算出；锻炼；开采完；精疲力尽；发展，发挥。
workout：n. 健身；练习；考验。

【例句】
He has made a workout plan and strictly followed it.
他制订了一个健身计划并严格执行。

I believe that you can work out this problem by yourself.
我相信你自己能做出这道题的。