Sequence the downswing from the ground up
Porzak frames the swing as two directions: the backswing is a top-down move where the upper body and hands go back together, and the downswing is a ground-up move where the hips and hands go together and the upper body gets pulled through by them. The cue is that you are not accelerating from your chest, you accelerate the hands and the lead hip. That keeps the transition sequenced instead of upper-body driven.
Channel: PorzakGolf
Watch official source at 3:27