Not sure if Aristotle said that but here are a couple of other quotes

“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.” - Socrates

“In order for man to succeed in life, God provided him with two means, education and physical activity. Not separately, one for the soul and the other for the body, but for the two together. With these two means, man can attain perfection.” - Plato. (I suspect this is a dodgy translation)