健身房的英文：
fitness center
gymnasium

参考例句：

After several sessions at the gym, I feel a lot fitter.
我在健身房锻炼了几次以后,觉得身体好多了。

Forcing myself to think about how to make extra money is like going to the gym and working out with weights.
我迫使自己考虑如何挣到额外的钱就好比去健身房做负重练习。

Our gymnasium lacks sports facilities.
我们的健身房缺少运动器材。

I did a two-hour workout in the gym.
我在健身房锻炼了两个小时。

He go to the gymnasium to practise every day.
他每天都去健身房练习。

Team member should register to the gym to participate in the weight lifting training.
队员应到健身房报到参加举重训练。

The athletic association gave a dinner in the gymnasium to all of the winners
运动员联合会在健身房请优胜者吃饭。

We can furnish all the equipment necessary for a hotel gym.
我们可以为饭店的健身房提供全套的必要设备。

Work out at a gym or swim twice a week.
一周去健身房锻炼两次，或游两次泳。

After several sessions at the gym, I feel a lot fitter
我在健身房锻炼了几次以後, 觉得身体好多了

fitness是什么意思：
n. 健康；适合，适当

This cap fits you better.
这顶帽子对你更合适。

To join by or fit into a gain.
在腰槽内连接或配合

This car is fitted with radial tyres.
这辆车配有子午线轮胎。

center是什么意思：
n. 中心；中心区；中枢
v. 使集中；把...放在中部；居中
adj.（在）中心的

The coronet must be evenly centered, and should have a pinpoint center.
头顶的冠必须是居中的，并且有中心点。

To draw into or toward a center; consolidate.
使集中拖入或引向一中心；集中起来

They had to reinforce the center.
他们必须加强中央的权威。

gymnasium是什么意思：
n. 体育馆，健身房；健身俱乐部

This is a gymnasium of our community.
这是我们社区的健身俱乐部。

Our gymnasium lacks sports facilities.
我们的健身房缺少运动器材。

The new gymnasium is situated at the eastern extremity of the city.
这座新体育馆位于城市的东端。