to show off one's masculinity

gymnasium / gymnastics / fitness center

endeavor, strive for, make an effort

to forge, to train

(anatomy) a muscle

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

as much as possible; as far as possible; to the best of one's ability; diligently

imperfective and stem (or continuative) forms of みせる (miseru) [ichidan]