[golfbulldog]

I agree with most of your stuff about kinetic sequence. But can I just check that I see the same things as you in that chart?

When you say the shoulders decelerate - do you mean time point green diamond?

I am not convinced that the arm rotational velocity increase much between green diamond and blue circle (time point for max arm speed)... the arm speed trace seems to plateau at about the same time as the shoulder rotation...approximately.

The thorax does increase in rotational velocity after peak pelvis rotational speed - That I do accept.

What interest me is the relative lack of vertical motion in the early DS pivot (top of BS -ie. pre red square - to green diamond) relative to the period in later DS ( green diamond to impact).

This is where the piston shoulder bit comes in I think... as i said earlier - it may be hand path that is effected most...your graph shows rotational speed...the shoulders move less in rotation in some DS segemnts and more in vertical direction it seems ...?

For Joe Norwood material i will PM (it is commercial so can not post on LBG)