...in TS, feel the bump left and simultaneously initiate rotation of the left hip ...weight is on ball of left foot at this time and you have lowered your height due to a bending the left knee. Up to this time you have kept your shoulders torqued up ...now, next move is to extend the left knee, release the torqued shoulders and shift weight onto left heel whilst resuming the left hip rotation back and slightly up ...key thought is to keep shoulders turning ...do not stop their rotation or you will flip thru impact ...also keep your LSB Right to maintain the swing plane and create CF ...always in the back of your mind should be a focus on impacting the sweet spot of clubface and an ascending blow with hands slightly in front of clubhead at impact (for driver) in a "hammer throw" technique