I had some strain in my right index finger. Solution? Left-handed trackball and mouse, so I can swap devices in my hands.
keyboards: ErgoDox (80key, Massdrop #1 PCB, FalbaTech compact PVC case); Noppoo Choc Mini (2012, black); Phantom (7bit); QFR (2012, ANSI, Frosty Flake); TypeMatrix 2030 (USB)… (and a large collection)
pointing devices: Kensington Slimblade trackball; left-handed Hippus Handshoe mouse; Roccat KPM; Roccat Lua; Logitech M570 (switch swap); Wacom pen-enabled digitizer… (and a large collection)
notable past keyboards: Access-IS AKE120807/1/M, ErgoDox (stock Massdrop #1), Kinesis Advantage, Lenovo SK-8855, LiteOn SK-6000, Logitech UltraX, SteelSeries 6Gv2
preferred keys: linear switches (e.g., vintage MX Black w/ 78g springs) and thick Cherry POM keycaps
touch typed in Colemak