"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 relationship between 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 and skill can only function at the peak of their capacity when the body is healthy and strong."
                                President John F. Kennedy

what this quote means is that being fit not means you will be healthy but it will let you focus to do better in life