I'm working with DD1 and DD2 on "the move" and sequence. A while ago I came across a clip I believe FFS posted showing proper knee cock by a student during a hitting lesson. The instructor actually laid down on the ground and moved the batter's calf towards the pitcher. The brief clip emphasized engaging the hip vs the back foot during uncoiling. Unfortunately, I cannot seem to find the clip. If anyone recalls where it is, please post it. Thank you for the help.