Keep for an own posture.

As more longer is our body keeping he in one position, thus we are less attending is on our posture,as keep spine straight and not low head.
As this test will help for check your posture. As stay with a spine to the wall, as touching with an occiput and shoulders, shoulder bladders, buttocks, heels, as if you are done this,thus your posture is good, thus keep on this,and if you could not, thus she needing in correction.
As sit right for the computer, straightening spine,that shoulders and hips finding is on the one vertical line. Hands are bended in elbows as under corner is 90 degrees and pre shoulders relaxed and finding are on the table.
Never sit is one leg on an other leg, as over squeezing here vessels, delay blood current, and delay processes display in a small pelvics. As monitor and keyboard are before you, as a sit half turned are bad for spine, and not attending assisting.
As under table put a massage carpet, ball with a small spikes, or apparatus massagers. Or use tennis ball, or glass bottle,they are rolling with feet's and catching with fingers of legs.
If your work is long work with computer as buy in orthopedic market are speciall  pillows are under waist and neck, they are supporting your vertebra and take a part of load is on itself.