Different guys have different fitness goals. It may be to be get performance in sports, it may be just to get stronger, it may be entirely about physique (although body building just for the sake of it is not really our thing). That would mean 'aesthetics' - wanting to look good with your shirt off. If that is what you want, you are in the right place to get plenty of examples to work towards!  A great post-workout sweat there! We'll finish with some rising stars from the younger generation who very clearly now what they want:  Work hard, boys, and your wishes will come true...  

 ...either in the gym itself (most have mirrors) or locker room (ditto) - and if no mirror, either a cameraphone stand or a mate to take the picture or video for you! Let's indulge in some admiration (and then turn it into personal ambition)! ... a bit extreme, that guy - but do-able, if you have unlimited gym time at your disposal!