so the weight never passes a 'center line' (toes to heel) of the trail foot - because the predominant movement is rotary the weight at the top of the swing is along the inside to centre line & into the heel.
do this good & there will be a bunch of pressure into the inside of the trail thigh, the trail glute/butt cheek will have rotated towards target - not moved aways from.
important the weight is not shifted laterally past the trail foot's center line, neither the trail knee or hip moved over outside edge of the trail foot.
good ways to feel the motion - just cross the arms over the chest & turn in posture to feel the upper body rotate with weight pressure into the trail leg but not over the center line of the trail foot, to do this the initial movement of the trail shoulder is turning/rotating behind the heel & butt, a 'feeling' the shoulder is turning behind the ear.
in a good upper body rotation & weight pressure movement there is a resistance into the trail leg.
{you imagine the 'tag' at the centerback of the collar of a golf shirt, imagine that tags 'position' at set up, the rotation then moves the tag a little ways nearer to target, it doesn't move that tag aways from target.}