[Seanmx]

Si . . . There's lag in the pivot. So the pivot components are ideally out of line and thus have lag. Pivot lag and swinging from the feet and the gear train all have to do with pivot lag and bringing maximum swing radius on the ball. The left shoulder is the center of the stroke yes . . . the left arm and club are the radius of the circle yes . . . but the SWING RADIUS for a full power shot ideally starts at the feet. The feet pull the ankles. Ankles pull shin bones. Shin bones pull knees. Knees pull thigh bones. etc. etc. all the way out to the arms wrists and club. If a trailing component gets in line with a preceding component the swing radius ends at that point. So you pull everything from the ground up starting with the feet. In the question the knee is seeking it's in-line relationship . . . if it get's saggy . . . radius stops there and hopefully not sooner . . . like at the wrists or something.

Excellent description of Pivot Lag.

This is a very important concept to understand. I know for my golf swing I cannot acheive accumulator lag unless I have Pivot lag first.

So thanks your excellent and succinct description of Pivot Lag.