While you are sitting, try to follow these techniques:
Keep your feet flat on the floor with your ankles in front of your knees. Adjust your position so your shoulders are relaxed. Keep your elbows close to your body, bent to 90 or 120 degrees.
Your chair should adjust to place your hips and thighs on a 90-degree angle with the floor. If your knees are higher or lower than your hips, try adjusting your chair or add a block or a footrest to keep a straight line from your hip to your knee.
Support your back by fully sitting in the chair (often we sit on the edge which doesn’t benefit our posture). If this is difficult to do, you may need to reposition or adjust the furniture.