"Since your mental state can have such dramatic effects on your body, obviously your physical condition can affect your mental well-being. It follows that regular physical conditioning should be part of your overall chess training."

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Man has got to take charge of Man.... Then real education, including pre-natal education. By real education I mean one that has no 'take-it-or-leave-it' nonsense. A real education makes the patient what it wants infallibly: whatever he or his parents try to do about it. Of course, it'll have to be mainly psychological at first. But we'll get on to biochemical conditioning int he end and direct manipulation of the brain.

— C. S. Lewis