The document discusses common causes of back pain from sustained posture and provides tips to avoid it. It states that the number one cause of back pain is any activity requiring staying in one position for too long. This can cause the back to get "stuck" in that position and hurt. It recommends taking breaks, stretching, and changing positions frequently to prevent back pain. If exercise doesn't relieve back pain, it suggests seeing a chiropractor to help the back function properly again.