# pumping iron

CEFR B2 · Idiom

Source: https://englishreference.com/word/pumping-iron
Updated: 2026-07-28

## Definition

to lift heavy weights as a way to exercise and build strong muscles.

For teachers: to engage in intensive weightlifting or bodybuilding. This figurative expression is informal and specifically refers to resistance training with free weights or machines.

## Examples

- He spends every morning pumping iron at the local gym.
- If you want to get bigger arms, you'll need to start pumping iron at least three times a week.
- While some athletes prefer cardiovascular endurance training, others find a meditative satisfaction in pumping iron within the confines of a weight room.

## Pitfalls

- Not "He is pumping irons at the gym." but "He is pumping iron at the gym." — The word 'iron' is uncountable in this idiom and should never be pluralized.

## Usage notes

- Usually used in a continuous tense to describe a regular hobby or a specific workout session.
- Teaching tip: The 'iron' refers to the metal plates used on barbells and dumbbells; it is a great example of synecdoche where the material represents the object.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.