It looks to me that MOST Bobs(backswing bobs) occur fairly late, as the player nears the TOP.
Now... what I'm interested in is WHERE(in the body) it is originating from, and WHY is it happening?
>Is it from a physical restriction, so the player sub-consciously raises the torso some in order to complete his Turn more easily?
>Is it from a reaction related to the golfer's attempt to elevate his arms?
>Is it a VISUAL thing?
WHERE> Is the BOB originating from the PELVIS area, the CERVICAL spine(neck), THORACIC(mid-back),or LUMBAR(low back), or other?
Lagster,
To help with your research please consider the following.
On good days, I don't bob or sway. On bad days, I do both. Arms, hands, clubshaft, upper torso staying connected during takeaway and backswing = no bob. Arms takeaway = bob, but not always. I've had some very good days using right forearm takeaway and I prefer it. However, my body is much more stable with a connected takeaway.