I do the same thing with my hips once or twice a day! For the deepest pop, I do it by sitting on the floor with both of my knees bent facing the same direction (one heel touching the other knee), then hold the inward-facing knee down and lean forward. I can also do it standing up, but there’s no way I can verbally explain that. XD

It’s weird though because it happens really easily, and if I don’t do it first thing in the morning it’ll happen while I’m walking and catch me off guard, and sometimes it hurts when it happens too suddenly. Oh well, lol