Most people will make a New Year’s resolution. And most people will end up breaking them. The problem comes down to willpower. Mainly that relying on willpower alone is a surefire way to end up failing. Sure it will work for a short time, but the prefrontal cortex, which controls willpower, is easily overwhelmed. Instead, you need to make plans that involve other parts of the brain to help keep you on track, like your emotions, reports WSJ.