Dang, I haven’t done this one in ages.
I see a lot of tips full of stretching exercises for artists flow across the Internet, but I feel like I never see the other important kind of exercise: ones to get good habits embedded in your reflexes, ones to train your form so that you’re less likely to injure yourself in the first place.
This is a thing I did to start every day at one of my first animation jobs: slap a piece of paper on the pegs, draw a quick circle in the upper left corner. Don’t worry if it’s shitty, don’t try to make it perfect. Just try to make the next one better. Because you are going to draw another one just to the right, barely touching it. And another, and another, until you’ve filled up the whole page. And you are going to do this by coordinating the muscles of your entire arm so that most of it comes from your shoulder and elbow, with finesse added by the fingers; the wrist should remain perfectly straight because bending it while drawing is how you summon the Carpal Tunnel Injury Fairy. Eventually you should aim to do all your drawing this way; this exercise is great for learning enough control to be able to do this.
If you start doing this, it is interesting to save your first few and compare them. Your first efforts will be frustratingly messy, but you’ll probably see some improvement over the course of a single page.