What is a more colourful way of saying someone who wants to gain weight, increase their muscle size by going to the gym?
He has been regularly visiting the gym in hopes of ___
Can I say ‘packing some guns’ here?
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Which means getting
Well defined muscles
It also doubles up as getting drunk.
If I understand your question correctly, you may be asking about one (or possibly both) of the following:
From how I interpret your question I am going to choose to address number 2. For number two I think it's pretty standard to say:
building up muscle
Has been regularly visiting the gym in hopes of building up muscle.
To become bigger, stronger, or bulkier: The actor beefed up over a couple of months so that he could play the part of a boxer.
(The American Heritage® Dictionary of Phrasal Verbs)
pack on size
There are millions of guys - commonly known as "hardgainers" or "ectomorphs" - who will never, ever pack on size.
pack on meat