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.

Definición y significado de "gym rat"en inglés

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