Making office desk more Arthritis friendly

I recently got a lovely job that had been very accommodating and understanding so far. They said I can bring my own equipment to help relieve my symptoms. They also said they might be able to get work to pay for some equipment potentially. I’ve got my own mouse and keyboard that I like, what are y’all’s favorite chairs/footstools/any other equipment you’ve used to help relieve your symptoms when sitting for so long?