What do you do to stay in shape/to stay healthy?

你怎么保持身材健康？

Do you work out?

你锻炼吗？

How often do you work out?

你多久锻炼一次？

What kind of exercise do you do?

你做什么样的锻炼。

Do you get much exercise?

你运动的多吗？

I hit the gym three times a week. 

我一周去健身三次

I'm thinking of wong out/signing up for a gym.

我正考虑去健身，申请健身会员。

I've got to get back into wong out again. 

我必须重新去锻炼了。

I want to get ripped. 

我想让我的肌肉更有型。

I work out regularly.

我定期锻炼。

I run five miles a day. 

我每天跑五公里。

I do twenty push-ups/sit-ups/pull-ups every morning. 

我每天早上做20个俯卧撑/仰卧起坐/引体向上。

Conversation:

A: Why don't you come over for dinner tonight?

你今晚过来吃晚饭怎么样？

B: I'd like to, but I don't feel up to it.

我想去，但是我觉得没力气了。

A: What's wrong? Are you sick?

怎么了？你生病了吗？

B: Not really, I'm just so tired these days. I just feel like going home and taking a nap after work.

没有，这些天我只是觉得很累，下班后就想回家，小睡一会儿。

A: You need to exercise more, it will give you more energy.

你需要多锻炼，那样精力才能更充沛。

B: Maybe you are right. It's about time I started to hit the gym again. 

也许你是对的，我也该再坚持去健身房锻炼了。