gym与fitness的区别：中文含义不同、用法不同、强调重点不同。gym作为名词，含义为“健身房”、“体育活动”；fitness作为名词，含义为“健身”、“健壮”、“适合”，侧重于表示一个人的健康状况或事物是否适合。

gym作为可数名词，译为健身房;体育馆;(尤指学校的)体育活动。

例句：The school has recently built a new gym.

学校最近新建了一个体育馆。

I work out at the gym most days.

我多数日子都在健身俱乐部锻炼身体。

While the lads are golfing, I work out in the gym.

小伙子们打高尔夫球的时候，我在健身房锻炼。

I overdid it in the gym and hurt my back.

我在健身房练得过火了，结果弄伤了背。

He spent more time perfecting his dance moves instead of gym work.

他把更多的时间用于完善舞蹈动作，而不是健身训练。

The gym can be used by both able-bodied and disabled people.

这家健身房健全和残障人士都可使用。

The Women's Gym is a women-only space dedicated to women of all ages, shapes and sizes.

女子健身馆对各种年龄层次、体型和个头的女性开放。

fitness作为名词，意为健身;健康;健壮;适合(某事物或做某事)。

例句：He convinced us of his fitness for the task.

他使我们相信他适合做这项工作。

There were doubts about her fitness to hold office.

她是否称职还不确定。

Regular exercise has a direct bearing on fitness and health.

经常性锻炼对于身体健康有直接影响。

I have little information as regards her fitness for the post.

至于说她是否适合这个职位，我无可奉告。

The long climb tested our fitness and stamina.

那次长距离爬山是对我们健康状况和耐力的考验。