Whenever you are sat at a computer you need to make sure you are comfortable and maintain the correct posture, so you do not strain or create more long-term health issues for yourself.
It does not matter whether you have a home office you have set up yourself or have to go into a commercial office environment each day you still need to consider the basics.
Firstly, it is necessary to get a good, sturdy chair that offers proper back support. This is crucial, especially when you think how many hours you will have to spend in that position at any given time.
Every now and then make sure you change the way you are sat and alter your posture.
When you sit down comfortably, be careful not to twist as this puts unnecessary strain on the muscles. It is also important not to have to reach out too much as this could cause an injury.
Make sure you give your palms and wrists some support. There are palm rests you can buy to provide this kind of support. You can also get aids to support your feet and legs too, so think carefully about what would be of use to you in this situation.