physical fitness 

" 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 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"

 John F. Kennedy

I believe that John F Kennedy is right for example when someone is sick they don't think about doing something intelligence they mainly because your body and mind is more focusing on getting better and making sure your getting enough sleep and that your eating right so your body can have the capacity to fight of the sickness you have your mind won't be focusing on being nice and making sure someone else okay because your mind body will know when it should be taking care of it self. For another example is when your not sick your mind and body functions the way it used to so it has time to think about other people you have time to be kind and ask for something if they need something its up to you to see if weather or not to be kind but everyone should want want to be kind. I for example i am a mean person when i want to be and when i want to be super nice and its that kind of nice that its even scary but if i wanted to be nice my whole life i would need to make my self practice everyday to be nice and not be mean to people because that how i would function but sometimes people are not in the mood to play nice like me and just gives a mean face to everyone.