如果想锻炼腿部，我推荐你用跑步机。

If you want to tone up your legs, I recommend using the treadmill.

谢谢。应该注意些什么？

Thanks. Is there anything that I should pay attention to?

嗯，有几件事情需要注意。首先，最好从慢速开始。

Yeah, there are several things. First of all, you'd better start with a low speed.

嗯，我明白。

Yeah, I see.

每十五分钟就喝一次水，还有每周使用跑步机的次数不要超过四次。

Drink some water every 15 minutes and don't use the treadmill more than four times a week.

好，谢谢。

Ok, thanks.