gym rat
US /ˈdʒɪm ræt/
UK /ˈdʒɪm ræt/

1.
kaki gym, peminat gym
a person who spends an unusually large amount of time at the gym
:
•
My brother is a real gym rat; he's there every day for hours.
Abang saya memang kaki gym; dia di sana setiap hari berjam-jam.
•
She became a gym rat after deciding to compete in a bodybuilding competition.
Dia menjadi kaki gym selepas memutuskan untuk bertanding dalam pertandingan bina badan.