" 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. Intelligence and skill can only function at the peak of their capacity when the body is healthy and strong"-JFK

What this quote means is that there is more important things in our body than just looks or not only physical fitness. Also you can be really ugly and out of shape but you are strong from the inside, and can be very smart. You dont need to be in shape to just be smart, or pretty. As long as you are intelligent and you know whats going on you are good.