I would spend sometime working on pre-swing actions that will allow them to get into a dynamic fyb leveraged hitting position like Carp, with no ball.. Once they are in the position grab there hands and barrel and have them work on contracting the core (ballistic) move. Once they own the movement (May take many days) then throw in a ball.. They should be able to tell by feel if they were able to get into the position before whipping the barrel if they own it..
YES!!!