The Republic by Plato Part 3 Page 63

Do you not observe that these athletes sleep away their lives, and are liable to most dangerous illnesses if they depart, in ever so slight a degree, from their customary regimen?

Yes, I do.

Then, I said, a finer sort of training will be required for our warrior athletes, who are to be like wakeful dogs, and to see and hear with the utmost keenness; amid the many changes of water and also of food, of summer heat and winter cold, which they will have to endure when on a campaign, they must not be liable to break down in health.

That is my view.

The really excellent gymnastic is twin sister of that simple music which we were just now describing.

How so?