“充满活力或非常健康”用英语表达可以是 fit as fiddle，寓意：

1、A very healthy person 非常健康的人

2、in very good health 非常健康

3、very fit and well 非常健壮的和健康的

4、healthy and energetic 健康精力充沛

5、a strong person 强壮的人

6、a physically fit person 身体健康的人

例如：

1、My grandfather is 90 years old, but he is as fit as a fiddle.
我的祖父已经90岁了，但他很健康。

2、She had fallen very ill, but with rest and medication, she is now fit as a fiddle.
她病得很重，但经过休息和药物治疗，她现在身体很好。

3、The team had partied late into the night, but on match day, each of them was as fit as a fiddle.
球队尽情欢乐到深夜，但在比赛日，他们每个人都充满活力。

解析：party 也可以作动词，意为“尽情欢乐；纵情狂欢”。

4、After a refreshing vacation by the sea, I now feel fit as a fiddle.
在海边度过了一个清爽的假期后，我现在觉得充满活力。

5、You may be feeling tired and sleepy now, but with a good night's rest, you will feel fit as a fiddle in the morning.
你现在可能会感到疲倦和困倦，但如果好好休息一晚，早上你会觉得充满活力。

解析：can 和 may 都可表示可能性，can 通常用于否定句和疑问句，而 may 则通常用于肯定句和否定句。


6、A few years back he was as fit as a fiddle, but long work hours and little sleep has wrecked his body.
几年前他身体很好，但长时间的工作和睡眠不足毁掉了他的身体。

7、That woman is 50 years old but she is running like a 20 year old! She is as fit as a fiddle.
那个女人50岁了，但她跑起来像个20岁的孩子！她非常健康。