1. Ensure that your buttocks are touching the back of the chair and you are sitting up with your back straight and your shoulders back.
2. Distribute your weight evenly on both hips.
3. Bend your knees at a right angle making sure they are higher than hip level.
4. Make sure you have is 2 to 3 inches of space between the back of your knee and the edge of your seat.
5. Ensure that you keep your feet flat on the floor, use a footrest if this is not possible or if on a stool, put the middle part of your soles on the footrest.
6. Try not to remain in the same position for more than half an hour.
7. When sitting up against a table insure that your arms are at an 90 degree angle and your shoulders are relaxed.
8. When sitting on a stool or chair that swivels, do not move the chair without moving your body with it.
9. Opt for a chair with good lower back (lumbar) support for the normal curve in your back. Additional support can be created using a lumbar roll, even a small pillow, or rolled up towel will have a similar effect.
10. When leaving the stool or chair, move to the front of the chair so you can bend your knees to leave the seat.