On the Self-Righteousness of the Fit

There is a certain sense of moral superiority among those who do everything needed in order to keep themselves in good physical shape. Working out is hard and painful. It takes discipline in the gym and more importantly, to get to the gym. Not eating the junk that is constantly being shoved under your nose in reality and advertising takes intentionality. Surely, we have a moral obligation to our health. Does this justify a sense of righteousness (expressed or not) by those who treat their bodies like a temple or is it merely a reflection of our current fashion, what we deem physically attractive?