The Seinfeld strategy is a simple but effective way to stay motivated, especially if you're starting a new habit in the first place. The strategy comes from some advice comedian Jerry Seinfeld once gave someone to help them stay motivated and consistent at work. He told me to get a big wall calendar, one page for the whole year, and hang it on a prominent wall. The next step is to get a big red magic mark. He said, "Every day I have a writing assignment, so I have to put a big red X on t...