This curl is not taught in Okinawan GoJu but it is reveled in kata Sanchin.
Many styles of MA turn the hips on a 45 degree angle to generate power from the hips. Okinawan GoJu is influenced greatly by CMA and therefore many of you will know about whipping power. Very penetrating , and disruptive to your opponents internal organs. Hard to explain on line and must be experienced for yourself. Power travels up and out through the hands. The shoulders play a very important part in the transfer, as they round forward and the chest sinks in. This movement stabilizes the whole area and allows power to travel down the arms and out of the hands. Try this exercise right now, stand up from your computer and go to the nearest wall. With your chest out, place your hands against the wall and push. Now from this same position with your chest out and your hands against the wall, drop your shoulders and sink your chest, and squeeze. If done in one fast motion you will feel this power. Weight lifters do this all the time when doing a bench press. They bring the weight down to their chest, which makes their chest expand, once the bar touches their chest they drive the bar up as they round the shoulders and sink the chest. Since the punch is a whole body experience you will find while standing and punching the hips will pivot up and the shoulder will drop and round while the chest sinks in and it will feel like you are squeezing. Do this fast and you will begin to feel a whip action. This action is not something you will feel right away. This body mechanics will allow you to generate power while you are in very close to your opponent. If you want to feel punching movements while lifting weights, then instead of a bar, try dumbbells while on a bench. Dumbbell benches will give you the whole movement from chest expansion to the rounding and sinking. As you breath, in weights, you will also breath this same way while punching. I hope this all makes sense. J
