Good posture improves your appearance and helps you project self-confidence and self-assurance. It is worth achieving just for the aches and pains it may prevent. Unfortunately, for many of us, good posture does not come naturally.
Study after study has shown that bed rest is the worst thing for low back pain, and that exercise can help. One type of exercise that you may not be familiar with is the Alexander Technique, which has been shown in clinical studies to work.