Pump iron
Definition 1 of 1
Pro Tip 1/3Slang Term
'Pump iron' is informal slang often used casually or in fitness contexts. 
After work, let's pump iron to blow off some steam.
Pro Tip 2/3Exercising Context
Use 'pump iron' specifically when talking about weightlifting as part of a workout routine. 
She decided to pump iron instead of running to improve her strength.
Pro Tip 3/3Masculine Connotation
Originally, 'pump iron' had a masculine connotation, but now it's used for any gender. 
Regardless of gender, anyone can pump iron to get fit.