Jim R said: It is indeed the 1st thing of importance to connect both arms to the core. Here's something my teacher taught me which is normally done with the teacher stretching out a student's arm. I discovered on my own that you can DIY Just stretch an arm to full straight extension, as though you are overreaching for something, and continue the stretch till you feel backstretch, go as far as you can. Once fully extended gently use the back and only the back to pull the arm back a few inches, repeat, repeat the following instructions exactly. You now have a rudimentary arm-to-core connection...now read on to see where you are headed.
"The important thing is first to connect your arm to the core. Once you are connected, the push forward movement of your arm will teach how the abdomen should react. Once you are good at that, you can reverse the procedure by moving the abdomen to move the arm forward. There is no simple way to explain how the muscle in the abdomen should move"
"Dear Master Hwa, When I try to move my arms from my back muscles, as you recommend, I feel the movement of the muscle in my stomach area (core muscle?). Does this mean that I am doing the movement correctly?"
"You got it!! It is the purpose of this exercise to connect
arm movement to the back and the abdomen muscles so that eventually you can use the energy of these muscles to power the arm movement."
"Sir, what should you feel in the abdomen? As you push forwards, do you pull the abdomen to the right? Or should it feel like your pulling the abdomen backward and to the right? Many thanks."
Reply: "The important thing is first to connect your arm to the core. Once you are connected, the push forward movement of your arm will teach how the abdomen should react. Once you are good at that, you can reverse the procedure by moving the abdomen to move the arm forward. There is no simple way to explain how the muscle in the abdomen should move"