Hi Bob, thanks for your response. Mostly I am trying to find some information online about how to do exercises to strengthen the hand but not exacerbate the hypermobility problem.

The problems initially were caused by typing in a bad position. Now I use a mechanical light-touch keyboard and am sure to not rest my wrists while typing. Trackpads destroy my fingers even if i just use them for a short while. I find using a mouse is fine so long as I do not rest my wrist while clicking, and I engage my forearm muscle. I sleep wearing splints on my wrists when it gets bad, but I had read that it isn't a good idea to wear these when typing