What works for me are movements that provide traction. Sometimes merely lying flat on the floor is enough. From lying flat, drawing knees to the chest increases traction producing some relief. With knees drawn up to the chest, maintaining shoulders on the floor, rotating knees to the floor will also increase traction. I'm likely to hear and feel some popping at any point during these moves. Quite often, first thing in the morning, just bending over with hands on knees will produce enough traction to provide relief. I do lots of stretching, daily, as well as exercises to strengthen core muscles.