This is a very gentle, simple but effective stretch for the low back. It can be very soothing and also helps give space to the lumbar spine.
Be gentle, work in a pain free range and try to co ordinate it with your breathing. It can be even more effective if you imagine your breath moving down to your low back and hips.
Spend a few moments grounding yourself in the “neutral position” before starting. See if you can detect a difference between each side of your body half way through.