The idiom "gym rat" is a relatively recent expression and does not have a well-documented historical origin. However, it likely derives from the concept of a rat being a creature that frequently inhabits or spends a significant amount of time in a particular place. It is used to refer to an individual who spends an excessive amount of time at the gym, often to exercise and work on their fitness.

Définition et signification de « gym rat » en anglais

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