As fit as a fiddle is a popular English idiom that can be used to describe somebody who is in very good shape.
As fit as a fiddle meaning: In great shape.
As fit as a fiddle origin: From England in the 1600's. Initially used to mean well-suited but “fit” later came to be known as in good shape. A fiddle is used because of the alliteration (fit/fiddle) and also because it's a nicely shaped instrument.
As fit as a fiddle examples:
Jerry is as fit as a fiddle considering that he's 84.
I was as fit as a fiddle in my thirties. Then, I got old and lazy!
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Check out this English slang expression:
https://www.youtube.com/watch?v=nBmzzg2myEk
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