I think by writing, both on a keyboard and paper. Tendonitis was prevented by using the Dvorak layout (keyboard model more or less irrelevant) and a fountain pe

I think by writing, both on a keyboard and paper. Tendonitis was prevented by using the Dvorak layout (keyboard model more or less irrelevant) and a fountain pen. Fountain pens reduce or eliminate cramping by not requiring pressure. You just drag the nib across the page to make a mark. The ink stands out as blacker for a given pressure compared to anything else I've used except maybe a thick technical pen with India ink (which clogs easily). I prefer older pens with flexible nibs. Modern fountain pens are designed for people used to ballpoints, so the nibs are very stiff and it feels like writing with a nail. These newer fountain pens may actually require pressure to make a decent mark, which goes against the ergonomics for me. Price is irrelevant; my Parker 21 or Noodler's Ahab, both with flexible nibs, write nicer than my Mont Blanc which admittedly looks prettier. The Noodler's takes some noodling to get the way you want (pulling nib tines apart, messing with the feed) which can be a pain in the butt similar to setting up X configs... sometimes you just want the tool to work. The Parker just runs beautifully as long as it's clean and used with Quink. Anyways if you write a lot, consider these, along with the Blackwing pencils if you prefer graphite. Also props to the reMarkable 2 (with the fancier "erasable" stylus).