hi
the main thing in any hip lateral movement is that the hips move towards the target and you have no hip slid on the backswing.
the use of the right knee in keeping the right leg flexed to stop any backward slid is very important if you try to have and hip slid in the downswing.
if you let your hips slid back even a little on the backswing it tends to make you swing out to in on the downswing.
the last thing you want is a out to in swing and the whole point of having any hips slid is to keep the club face looking down the target line longer so you MUST control and backward slid with your right knee.
cheers
Bill

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