as fit as a fiddle可不是说身材像小提琴般，而是指非常健康、身体很好、身体健康。

【例句】
He is as fit as a fiddle though he is already seventy.
尽管已经七十岁了，他还是非常健康。

Xiao Wang has completely recovered from his illness and is now as fit as a fiddle.
小王这次病已完全好了，现在非常健康。