I have a pretty specific style of working. I work about 15 hours a day, so that's how I've organized my work: I work 2 hours standing, then 1-hour sitting, then a 15-minute walk, and then 30 minutes of working sitting. Then repeat. And I feel nice (yeah, a person can feel nice working 15 hours a day). I just love my job. As for desks and chairs, at the office, all the furniture we have is made by Eureka Ergonomic. It was the choice of our manager, so…probably it's the best choice she's ever made. Anyway, the only option is to work by changing your working style. Then your joints and muscles will be OK. Btw, don't forget to visit a physiotherapist.