I tried searching this subreddit but couldn't find the same question.

A likely paraphrased quote makes rounds on the internet in the fitness sub culture which is often accredited to Socrates:

No citizen has a right to be an amateur in the matter of physical training... what a disgrace it is for a man to grow old without ever seeing the beauty and strength of which his body is capable.

However I cannot find any evidence that Socrates stated this, possibly because I don't really know where to look. If this was no Socrates, is it possible another Greek philosopher would likely have said something along those lines?