I too use office type chairs. I have removed the arms of several chairs.
I have the tightly woven commercial carpet, so I have to use the plastic chair mats under them.
I love the ones that I can also lean back in for a change of position.
I bought 2 saddle type stools for my knitting machines. I'm not sure about them yet. I haven't been able to use the knitting machines until my cardiologist ok's it.