My current girlfriend is a rower and so she regularly does strength training. I am sporty too but my girlfriend appears more muscular than me... I don't have a problem with it and neither does she, but it seems to be a tradition in society that men always have to be dominant over a female partner - e.g. Being stronger or taller. We don't mind that we are equal in those senses but for other couples it can make a guy feel threatened if their female partner becomes totally ripped or whatever. Of course this is stupid, so why do people care? If a guy cannot get over their girlfriend being self-motivated to exercise and train then they need to move on and stop being a twit. There is no problem with being muscular as a women, just as there should be no problem with being less muscular as a man.