flexer
noun/ˈflɛksə(ɹ)/
Etymology From flex + -er.
1
One who flexes something physically.
- Muscle flexers and weight lifters have been given academic approval by a University of California scientist.1963, Popular Mechanics, volume 119, number 4, page 80:
2
One who flaunts or shows off.
3
Diminutive Diminutive of influencer.