musclebuilder

/ˈmʌsəl ˌbɪldər/
noun
  1. Alternative spelling of muscle-builder; a person who develops large, strong muscles through exercise.
    • She follows a diet recommended by professional musclebuilders.
    • Many musclebuilders focus on protein-rich meals to support their workouts.
    • The gym is full of musclebuilders training for competitions.