gym rat

[ jim rat ]

noun

, Slang.

1. an exercise and fitness enthusiast who spends a lot of time at the gym, working out frequently or for long periods of time:

   Whether you're a gym rat or a total newbie, these sets are worth exploring.

Word History and Origins

Origin of gym rat¹

First recorded in 1970–75

Example Sentences

A hardscrabble gym rat who could develop a new culture, instill a timeless work ethic, and shape a complete team that would thrive around Anthony Davis and excel long after LeBron James?

From Los Angeles Times

I’m sure there are plenty of gym rats out there who know the feeling.

From Los Angeles Times

He is the gym rat who will be in the gym at 6 a.m. shooting with players until late at night.

From Seattle Times

Now, in Britain, a group of bodybuilders, personal trainers and sundry gym rats have stepped unto the breach.

From New York Times

One of the gym rats hits on Jackie after the gym closes, but when he grabs at her, she punches him, hard.

From New York Times