Sitting in your chair, move your hips back as far as you can until they are against the back of the chair.
Adjust the seat height until your feet are flat on the floor. Your hips should be at the same height or slightly higher than your knees.
Remove all objects from your back pocket, and sit with your weight evenly distributed over your buttocks.
Adjust the backrest height so that it is comfortably resting in the curve of your lower back.
This position will allow maximum support and relieve unnecessary stain on your body throughout your work day.