Holly Firfer tells us how going overboard on good habits, isn't always a good thing. <script type='text/javascript' src='http://z.cdn.turner.com/cnn/van/resources/scripts/van-widgets.js'></script> <div data-cnnvansinglewidget data-affiliate='gantdaily' data-videoid='living/2016/01/05/what-happens-when-good-habits---go-bad.cnn' data-size='auto' data-autostart='true'></div>