Any woman who takes care of her body and cares about her physical appearance and works her ass off (or on ?) to achieve her goals is very sexy to me.
I have done many years of hard work in the gym to achieve my current physique, and I respect any man or woman who has put in the hard work to achieve similar goals. I think it's totally sexy, JMO. Although I have never dated a female BBer, but hopefully one day I will find one that isn't already dating a guy bigger than me HAHA!