Lifehacker is where I first saw the notion of a “Seinfeld Calendar”:
He revealed a unique calendar system he uses to pressure himself to write. Here’s how it works.
He told me to get a big wall calendar that has a whole year on one page and hang it on a prominent wall. The next step was to get a big red magic marker.
He said for each day that I do my task of writing, I get to put a big red X over that day. “After a few days you’ll have a chain. Just keep at it and the chain will grow longer every day. You’ll like seeing that chain, especially when you get a few weeks under your belt. Your only job next is to not break the chain.”
“Don’t break the chain,” he said again for emphasis.
My idea is simple: add doing something you want to do as an additional requirement to what you should do, before you can mark your day X’ed. I think both tasks are equally important.