Interesting topic. I've always had an anterior tilt in my pelvis, and believe it to be the root cause of my swing problems. So roughly 2 years ago I began tucking under for a while as my sole swing thought and was really hitting it well..until I tore a stomach muscle and had to abandon golf (and football) for a while so haven't tried it since...forgot about it. On a similar note was working on my rounded shoulders this evening on the range after seeing some footage of my swing, however noticed no improvement on strike and my back is still bit uncomfortable regardless. Must try the latter solution once more without engaging the core this time.