Writing capacity is more like a battery than a muscle
I’ve long hoped that writing worked like a muscle, and that by writing long and hard enough, I could develop that muscle. That much like a runner can run both faster and longer after training, I would be able to sit at the computer and pound out intelligible prose faster and for longer stretches of time.
I don’t think that’s the case, though. I now think writing is more like a battery than a muscle. You can draw on the writing battery, but eventually it runs out and needs to be recharged. If you don’t use it enough it will become corroded and stop working.
But the thing about batteries is that they don’t hold more of a charge the more times you run them down. Nor do they acquire a higher voltage the more you use them. If anything, they become weaker and shorter lived over time. And that’s fine, I suppose, so long as you get good use out of the battery while it lasts.