A healthy sitting position can be critical not only to your comfort, but also to good postural and spinal health. Here are simple things to pay attention to:
---have both feet flat on the floor,
---your knees should be slightly lower than the level of your hips,
---your back is resting comfortably against your chair, and
---your head is in line with center of gravity of your body (avoid head-forward postures).
One of the most important features of whatever chair you use is that you can change the height of the seat.
In most cases, t's not necessary to spend lots of $$ for a fancy chair. You just need to be able to adjust the height of the seat, so that your knees can be slightly lower than the level of your hips.
