I'm stunned 3 years of lessons and the first I've heard of IR??? Love the bat drill, it all makes sense. Kinda noticed it in the hill house videos I've seen but just shut my ears!!
Stand in the K position "Like after toe touch in the stride" hold a bat in the pitching hand and swing the bat like you are hitting ground balls to the infield with one hand...the bat forces the arm and wrist and everything to do what it is supposed to do...
Well I live just north of central Illinois and have no one teaching this release!