Inspired idea! Getting started has always been the difficulty for me, procrastination, fear, etc. Establishing the daily discipline of writing first thing each day. Writing even when I don’t feel like I have anything to say. If I write long enough eventually the good stuff comes. The insights that are sharable, my message to the world.
The other benefit of your approach is that by limiting yourself to 100 words it forces you to be succinct as a writer, another important skill.