SSS

"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 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" By JFK

This quote is telling us that if you're not sick or something that you can work at your best. This means you won't have any mistakes with anything you do. Also that if your fit that you wont have to worry about anything else but what is happening at the moment.You won't be distracted will and work with what you have to do at the best capacity.Simple things like going to the gym and workout will help you on your work. A good example for this would be be if a guy is fat and wants to lose weight.He won't be able to concentrate with the task a hand. He will only think about losing the extra pounds he has.