By Patricia Neill Despite what many people believe, just exercising at the fitness center every week isn't enough to become truly fit and healthy. Any Del Mar personal trainer will tell you that the key to being and staying fit is to be active in your everyday life, and not just when you go to the gym for your weekly workout. Why You Should Remain Active The process to becoming and staying mentally and physically fit is a never-ending one. Once you get to the level of being fit, you should keep up your progress to make sure that you stay...