fit wie ein Turnschuh #idiom (Podcast S01E21)

Today, we talk about the German idiom “fit wie ein Turnschuh”. What does “fit wie ein Turnschuh” mean?
as fit as a fiddle; literally: to be as fit as a gym shoeidiomHyphenationfit wie ein Turn·schuh
Meaning[1] athletic, trained
Synonyms[1] athletisch, durchtrainiert, fit, sportlich
Example[1] If you want to be “fit like a sneaker”, you have to train a lot.
(Source: Wiktionary)
Personal RemarksAs a matter of fact! If I do not train, I’m not fit.