The Following are Playlist by categories. Once you start playing a video in that category let it run until the playlist has ended on that category that way you will benefit form all the exercises designed on that category.
Low Back & Core
Outer hip stretches
"If you have trouble sitting crosslegged, if you have sciatica, and if you have low back pain that you feel in your butt, try these stretches.
Be careful, of course, and don't do anything that hurts!" (Lu Mueller-Kaul)
Upper Back and Neck
Whole Back & Core for Articulation of the Spine