Having and maintaining a good posture is a major step in preventing back pain. When leading a busy lifestyle, the basic warning signs of back problems can go unnoticed.
THE IDEAL POSTURE:
The ideal posture would allow for a line to hang straight through your ear, shoulder, hip, knee and ankle. Try and stand in a relaxed way but gently contracting your abdominal muscles. When sitting, the same is true. The gravity line should pass thorough ear, shoulder and hip.
You can find more advice and tips on general posture advice here