Remember these Important Points:
1. Shoulders relaxed, not elevated. If you can have your forearms supported comfortably down at the same level of your keyboard- even better.
2. Keyboard should be at the same level of your elbows when your shoulders are fully relaxed at your side.
3. Feet flat on the floor.
4. Use a lumbar support if possible.
5. Monitor should be directly in front of you at just below eye level.
6. Keep your mouse close and at the level of you keyboard.