Not that much as long as you first focus on your nutrition, which is the foundation to life. I suppose it is time now to remember that indeed - 'we are what we eat' - as the old adage goes. Or to put it in cyberspace computer terminology, garbage in garbage out!
Think about that for a moment and take a hard look at how you have fared in the last year or many years past. Take stock of the year that was, and make an honest assessment of your diet and health. Exercise included.