[hcw]

Consider, === as the hip plane and / as the clubshaft plane and then explain how the horizontal plane, rotary, shifting of the former can initiate the inclined plane downward motion of the latter.

burner,
set up the exercise i described earlier with the club at shoulder height...with the club all the way back, turn just your hips and watch how the shaft moves "downplane" toward the imaginary shoulder level ball...now incline the plane by bending at the waist and then turn your hips back and watch the shaft and your trail shoulder move back "upplane"...the "secret" is that your hips aren't horizontal to the ground during a golf stroke.

-hcw