This is an interesting video about back pain. It is good to have the visuals. He makes some good points. We sit for too long in chairs weakening our back muscles. So we can do exercises to strengthen the back and the core muscles. We don’t exercise our knowledge of where we are in space enough. Balancing exercises helps us to know where we are in space.
Sitting at a desk makes it harder to get exercise naturally.
Try sitting at the edge of the chair, rather than leaning into the back of the chair, that will strengthen the paraspinal muscles on either side of the spine.
The stronger the paraspinal muscles, the straighter your back and the less pain.
For your shoulders, try this in the shower with the warm water flowing onto your shoulders and down your back.
First, tuck the pelvis. You can cue this for yourself by putting on hand on your abdomen and the other on your lower back. Then, push the hand on your abdomen back so that your lower back flattens.
Next, reach your hands up onto the shower wall, palms flat on the wall. And lean towards the wall a little. You will feel a nice stretch in the upper back and shoulders.
All the while keeping your lower back flat and your pelvis tucked. This protects your lower back.