Lex I: Corpus omne perseverare in statu suo quiescendi vel movendi uniformiter in directum, nisi quatenus a viribus impressis cogitur statum illum mutare.Or, roughly translated from the Latin: A body at rest remains at rest, and a body in motion will move in a uniformly straight line, unless it is acted on by an outside force. Inertia is the resistance to changing that state of being.
So, our lives have inertia too. I fell out of the habit of painting a few weeks ago, and, having fallen out of the habit, I have to make a conscious effort to reclaim time for painting, to physically sit down, and pretty much force myself to paint. It takes time (beyond painting), effort, and I have to make it a deliberate choice. By contrast - I run at least a mile. Every day. I have done so for 1400+ days. It is rare for me to have to deliberate when it comes to running. For the record, I do have days where I have to talk myself into it, but most days, at some point, I change and go for a run, even if it is on the treadmill, without it being any sort of struggle or contest of wills.
I want to make painting a habit. I want it to acquire an inertia of its own, so that, on most days, I wind up wandering down to the basement, even if it is only for ten or twenty minutes, to work on painting - whether it is actual painting, or doing all the prep work, or finishing off the bases.