IPA: /ˈbɒdibɪldə/
KK: /ˈbɑːdiˌbɪldər/
A person who trains their body through exercise and diet to develop large muscles and improve their physical appearance, often for competitions.
He has been a dedicated bodybuilder for over five years, competing in several competitions.
Bodybuilder → It is formed from "body" (from Old English "bodig", meaning the physical structure of a person or animal) and "builder" (from Old English "byldan", meaning to construct or create). The word "bodybuilder" refers to a person who constructs or develops their physical body through exercise and weight training.
Think of someone who is 'constructing' ('builder') their 'physical structure' ('body') — that's what a bodybuilder does.