What is the meaning of Gym rat ? - Question about English (US)

Complete Your Home Gym Set up in One Go: You will get PC06B power rack x 1, black barbell x 1, S2 weight bench x 1, 10LBS weights x 2, 25LBS weights x

ER KANG Power Cage Home Gym Package, Power Rack with Cable Crossover System, Squat Rack with 230LBS Weight Plates, Bench, Barbell

Graphene: Fast, Strong, Cheap, and Impossible to Use

Gym English: Vocabulary for the Fitness Center - let's get in shape!

PPT - Dialects Found in US English PowerPoint Presentation, free download - ID:4780971

The Crucial Difference Between 'Cheesy' and 'Corny' - The Atlantic

Did anyone else's gym rat get taken away? : r/NBA2k

10 Common Gym Questions Every Gym Rat Should Know

Gym Rat is gone : r/NBA2k

See the Dramatic Changes In Bodybuilders' Physiques Over the Past 125 Decades

Nike Dunk Low Next Nature White Gym Red (Women's) - DN1431-101 - US

Gym rat Meaning