This troper's first crush was a farm girl who moved to his area around the time he started high school. The first thing I noticed about her was how beefy her arms and shoulders were, and she was never shy about showing them off. My favorite example of this was when a guy in our English class did the classic "have you seen my beachball?" routine, trying to impress, and she just said, "please", and rolled up her own sleeve, revealing that her muscles were quite a bit bigger than his. Add to this that, while good looking to begin with, she eventually became absolutely gorgeous,
had glasses, and had a personality reminiscent of the ManicPixieDreamGirl, and it took me a LONG time to notice anyone else.