Where did the phrase "pump iron" come from?

Hi tonez9,

Thank you for your question.

Pump Iron   
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Etymology (origins of word): 

The weights that a bodybuilder lifts are made of iron or some other
heavy material. A 'pump' is a device that moves water through
repetitive motion. So the phrase 'pump iron' describes the act of
lifting weights again and again.

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phrase origins "pump iron" 

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Best regards,
tlspiegel