I know what a shower/grower is but what determines if you are one? Last month I was swimming with some of my cousins, 6 male cousins all brothers. Three of the brothers are really close in age and everyone mistakes them for twins. But when were were finished swimming and showering they look different - shower/grower wise. Two of them are just plain showers these guys are a little more athletic then the other one who is a grower. Does your activity level have something to do with it or is it genetics, or another factor?