I did have a surgery a few months ago, but I'm as fit as a fiddle now.

我确实在几个月前动了手术，但现在我身体很好。

youdao

To see a game through to the final whistle while maintaining high performance, a player needs to be as fit as a fiddle.

要想在保持高水平表现的同时把比赛进行到底，运动员需要非常健康的身体。

youdao

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。

youdao

"I'm very fortunate, I'm as fit as a fiddle, " said Mr Jones, who still regularly works for Newport estate agents Crook and Blight.

BBC: Loyal support of football fan, 91

Sixty years old and fit as a fiddle.

NPR: Roth Rewrites History with a 'Plot Against America'