"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 the soundness of the body 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."

This quote by John F. Kennedy is telling us that we not only have to be mentally strong you should also be physically strong. We must learn to defend ourselves and become stronger. We know that knowledge is important but what will protect that knowledge, your body. If your body is not healthy and strong then your mind won't be either. You want to eat healthy and have physical activity a few times a week. You should stay in school to make your brain stronger. After you should go to the gym and make your body strong. And all day you should be eating healthy in order to be healthy and not get sick.