Good Sitting Posture
Your back has three curves -cervical (neck), thoraic (chest), and lumbar (lower back). All three curves should be aligned to keep your back in balance. Often, we slouch in our chairs or bend forward over our work, which throws these curves out of balance. 
  
Try the following tips to support and balance your back while sitting. 

1. First, place a pillow (or rolled up towel) at the back of your chair seat to support your lower back. 

2. Then, move your seat as close to your work as possible to keep from bending forward.

3. Finally, angle your work (or VDT screen) so you can look straight ahead rather than looking down.

4. Strong, Flexible Muscles

The following exercises help build strong, flexible muscles to support your back. They also help relieve tension that can occur when you sit in one position for a long time. Each exercise takes only a few minutes, and can be done while you sit. Try a few and feel the difference! (Note: Be sure your chair is stable before beginning these exercises and stop if you feel any discomfort.)
 
Sit Back and Relax
Once you learn how to care for your back while you sit, you can sit back and relax, knowing that you’re keeping your back healthy and strong. Sitting doesn’t have to be a Pain in the back if you keep fit while you sit.

• Let your head roll forward. Slowly rotate your head without straining your neck. Repeat 5 times in each direction.

• Sit as shown with feet flat on floor. With your hands on chair (or desk) for support, slowly raise your thighs a few inches above your thighs a few inches above your chair seat. Repeat 5 times.

• Clasp your hands behind your head and push your elbows back. Release the tension, then repeat 5 times.

• Slowly lean forward until your upper body is resting on your lap. Hold for 10 seconds. Place your hands on your knees. Sit back up. Repeat 5 times.