The instruction is very simple elbow in turn the waist
I found that I had bent my wrist in Block touching coat and that I repeated this wrist turn in the . Kelvin helped me understand what I had done, after correction suggested I use a mirror at home to reinforce the elbow without moving my wrist independently. I took this advice and found that It really helped.
So now I bring my elbow in, it rotates more easily by turning the waist and then the straighter arm always the hand to extend better