Some interesting facts about your spine and why it starts to hurt... the links below this also helps by providing simple solutions that change behaviours you lead your spine towards deteriorating health.

This guy tells it like it is! He's harsh, but sometimes you need harsh.
This is his "pin the arms on the yogi" take and I LOVE it!

The Daily Bandha Blog is a great, great resource. In this video, they describe, with video, the main actions required to site tall. Here is the link to the description.