Trying to explain the actual motion is really hard.





The best explanation for what I think you are asking is that the back foot pushes the ball into the ground, driving the opposite hip up and forward. My plant leg stays bent and shifts into the plant toe, then instep, then heel.





As the heel strikes the ground, my hips are done shifting forward. They might shift 1/2" or something, but the plant leg is stopping the forward momentum.





There's now the timing that the elbow extention should be maxed out at the point of the heel striking the ground.





During the movement of the hips moving forward, I tend to look for the torsion of the back swing to be unloading as well, timed to hit the elbow extention and heel strike.





Probably more complicated in text than in the video.

McBeth corking the shoulders

Will with the lean back hip shift.

This is an explanation for a fella that has been trying to master the bracing motion (this is for 1 step shots). The pillow idea came from this video: https://www.youtube.com/watch?v=iXQkjIKmjaU - you can use car blocks, towels, even a slanted curb to get the feel for pushing on the instep.