Willpower is a myth. The problem with trying to use willpower to achieve and sustain a behavioral change is that it is fueled by emotion. And as we all know, our emotions are, at best, fickle. They come and go. When your emotions start running down -- and they will -- even your best-laid plans will fall flat.
The stories leaders and others tell, few of which are true, are a lousy foundation on which to base any sort of science, and we know how to accomplish behavioral change and the importance of priming, informational saliency, and social networks. Producing inspiration and other good feelings doesn't last very long.
The principal task is to put spiritual foundations under both our child's life and our own. This triggers a shift in the elemental way in which we relate to our children, with the result that their behavior automatically falls in line as they become aware of, and true to, who they really are. Behavioral changes are an outgrowth of a shift in the relationship.
The problem with New Year's resolutions - and resolutions to 'get in better shape' in general, which are very amorphous - is that people try to adopt too many behavioral changes at once. It doesn't work. I don't care if you're a world-class CEO - you'll quit.