Working hard at the gym is great, it is healthy and gets your body in good condition.
Having an attractive body is a by-product from that and people shouldn't feel ashamed of it.
However like all things it has more effectiveness if it is understated. You can tell when a guy has a good physique under his clothes anyway.
Women are going to be more impressed by a cool and charming guy that has an impressive physique under his clothes than a guy that covers social media with selfies of himself topless in front of a mirror. Especially as these days in the tinder era, those kind of pictures tend to be correlated with guys that converse in illiterate messages like "hey how's u? wot u up 2? u horny? wanna c my **** lol?"