"Physical fitness is not only one of the most important keys to a healthy body, it is the basis of dynamic and creative intellectual activity. The relationships between the soundness of the body and the activities of the mind is subtle and complex. Much is not yet understood. But we do know what the Greeks knew: that intelligence ans skill can only function at the peak of their capacity when the body is healthy and strong."

 

John F. Kennedy

What I think this quote means is that