Dear Reader, Picture this: Boxing Day. You're sitting there, stuffed, after yet more Turkey leftovers, Christmas Pud and After Eights. Yet you feel smug and relaxed. Because you know that in January you're going to do something you've never achieved before. You're finally going to drop that excess weight and shrink your waist! Instead of making hung-over New Year's Resolutions that never really last beyond February. Plus, you've saved a shed-load of money! How come? You've taken advantage of...