PS: Also learn good posture from a good yoga or martial arts instructor. Read books like this: http://www.amazon.com/Steps-Pain-Free-Back-Solutions-Shoulder/dp

PS: Also learn good posture from a good yoga or martial arts instructor. Read books like this: http://www.amazon.com/Steps-Pain-Free-Back-Solutions-Shoulder/dp/0979303605 http://www.amazon.com/Steps-Pain-Free-Back-Solutions-Shoulde...