A flywheel is a big heavy wheel that “resists changes in rotational speed”. In other words, it’s hard to get it moving, and then also hard to get it to stop. An instrument of inertia.
You might imagine that, after blogging daily for months and months, it would be refreshing and beneficial to take a break. Recharge the batteries, et cetera. That you would return to blogging with a new zeal.
My experience is that blogging is more like a flywheel. Once you stop, it’s hard to get spun up again. This is true for work in certain respects as well.