According to one study, it takes an average of 66 days to form a habit. If you’re struggling to stick with your New Year’s resolutions, entrepreneur Marc Sparks has some advice for you: write down those resolutions! And don’t use your laptop or other mobile device—write them out by hand. And do it every week. The point isn’t to make it easy—the exercise is to make sure you redo it so you are reminded of everything you want to accomplish. The more you do something, the more natural it becomes. It’s about repetition and habit. Read more here.