Some stuff to try for your back:
Lie down on a hard surface, face-down, with your elbows right by your side. Now lift up on your elbows so that you are stretching your torso, push your arms up a bit, and look straight ahead. Hold it for several seconds, then rest and repeat.
Also try the cat-back, when you are on your hands and knees and stretch your back up towards the ceiling. Then try sitting up with a chair to your right, grasp the chair and turn while upright towards the side of the chair. Do a couple repeats of these exercises.
It will take a couple of days of these exercises to feel a noticeable difference but they are good ones...we use them in OMM all the time.