Definition

To show off your physique or strength—informal gym slang that's somehow made it into official fitness vocabulary. It's Instagram personified.

Example Usage

He flexed his new pump in the mirror for five minutes after his workout.

Origin

Slang term popularized in hip-hop culture; adopted by gym culture.

Fun Fact

Flexing actually increases muscle activation and can serve as a training stimulus, which is why bodybuilders pose—it's not just vanity.

Source: Gym slang, contemporary fitness culture

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