5 tips for good sitting posture

1- Sit with your bottom firmly at the back of the chair, with your back pressed against the seat back.
The standing position is the best and most natural position for the body. Working in a sitting position increases the amount of pressure placed on the intervertebral discs. Sitting with a straight back ensures that pressure is evenly distributed between the discs, supports the thoracic cage, increases lung capacity, facilitates breathing and improves cardiac performance.

2- Adjust the height of the seat back so as to ensure that your lumbar region is well supported. This supports the thoracic cage, thereby preventing your back from slumping, and promotes good blood circulation.

3- Adjust the seat height so that your feet rest flat on the floor or on a footstool, in order to minimise pressure beneath your thighs. Your thighs should be as close as possible to a 90° angle with your legs, regardless of the angle of your seat back.

4- Adjust the height of the armrests 
It is advisable to configure a work space that enables you to work with your arms as close to your body as possible. Resting your forearms on the armrests relieves pressure on the vertebral discs and reduces tension in the shoulder blades and neck. Whether fixed or adjustable, armrests should be positioned to suit the individual and the specific task concerned. They should also be able to fit underneath the desk.

5- Adjust the seat back inclination angle according to your weight. Avoid working in one fixed sitting position. To relax your back, alternate between a sitting position tilting forward and a sitting position tilting backward.