i struggled with lower back pain all my life. doctors suggested shoving metal in my spine. since removing all the chairs from my home and office and only sitting on the floor, i have better resting posture than my peers (since i am unreliant on back supports), and the pain is gone.
hilariously, the East has had this solved for thousands of years, while we continue to creep toward death in debilitating pain.
you may replicate this setup in your own office by going to Ikea, purchasing the cheapest, lowest bench available, and sitting in Burmese posture [2]. if your knees are in pain, forego the round cushion for a higher square cushion [3] or adjustable sitting bench [4]
[1] https://smile.amazon.com/dp/B00G9FMY9K/ref=twister_B00G9FMYC...
[2] http://d2r5da613aq50s.cloudfront.net/wp-content/uploads/0-76...
[3] https://smile.amazon.com/Pure-Life-Meditation-Cushion-Tibeta...
[4] https://www.kindseat.com/meditation_seats/kindseatplus.html