I was trying out Art's bumpy back and working on handpath for the past couple of days and my right side (quadratus lumborum muscle) was getting extremely sore. I played today and my right side was absolutely killing me right after impact. I noticed then that I was keeping the right hip back so that at impact and right after, my pelvis was still parallel to the target line and my right side muscle (quadratus lumborum) was basically the only muscle resisting the pull of the club into the follow through. I had basically overdone bumpy back and was so focused on handpath that I was not using any pelvic/hip turn. I was also still missing the ball to the left.
So, I started trying from the transition to get the hands going vertical until the left arm was parallel to the ground or even a little farther down and then turning the pelvis/hips trying to get the belt buckle facing the target more. It seemed the pelvic turn also helped in not closing the face too soon as I was not missing shots left. I could only swing about 70% because of my side pain which was reduced by doing this, but I was hitting the ball much better and on target.
It seems to me at the moment that for me it is at least a hand path and pelvis issue. I'll take a few days off to let my side calm down and get back to work on it.
Dear spktho,
Just read your very descriptive account of pain developing as a result of TOO MUCH KEEP IT BACK, while you were changing and concentrating on arm and hand path issues. PLEASE don't try to augment BBKIB with other voluntary body movement experiments. With BBKIB, the upper 'body optimized' positions, including the arms need only be carried thru the transition and downswing, involuntarily, WITH YOUR PRESENT UNALTERED SWING.
Also, since you make no mention as to the starting position and possible movement of your lower body, especially the coccyx, as described in previous posts, to have lower body dynamic stability MARGIN, it is necessary that it be pointing straight down, or better yet towards the rear foot.
Regarding the downswing, the rear (right) hip should FOLLOW and kind of be 'rotationally pulled' and be just rotating slower than the forward (left) hip. Depending on swing style, and the degree of involvement of the rear (right) side in 'hitting', and the hand/arm path variations you are using, the rear hip and quadratus lumborum, should have different rotational paths, but the rear hip should not ever be forcefully held and NOT rotate until impact.
Finally, and maybe a better 'visual' would be that the 'screw axis of rotation' for the pelvis from the top of the back swing until impact moves from near the back hip joint to near the front hip joint NATURALLY, that is involuntarily, rather than as you said, "trying to get the belt buckle facing the target more".
If you have further interest, and if possible, a video of a single swing in the past, where you have felt pain would be appreciated.