In service of my arm and wrist health, I type on a Kinesis Advantage360 Pro and customize my keymap with ZMK.

I previously used an Ergodox EZ with TTC Flaming Purples. This keyboard was amazing - the Flaming Purples are a great typing experience, and the software from ZSA is incredibly well-done - but unfortunately, it didn't end up fixing my wrist issues in the same way as the Kinesis.

Here is my current layout, drawn with keymap-drawer. This image automatically updates whenever I make a change to the layout and rebuild the firmware!