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. John F. Kennedy It is a well-established fact that we depend on our fitness and good health to lead a long and productive life. In our childhood, we feel invincible, and often think that way. So how can we protect our good health as we get older - in order to maximize our productivity and enjoyment of life? Have any of the following questions ever occurred to you? Is there a secret to losing weight and/or building muscle mass? Is there a secret to...