Flying Crane
Sr. Grandmaster
Years ago we were taught that we could develop extra thrust by pulling the other shoulder back but I don't believe this. In fact by pulling the shoulder back we are actually reducing the power of our punch. We have our energy going backwards as well as forward.
This is not correct, but it must be properly applied and understood in order to work.
In some Chinese arts such as Tibetan White Crane, the very basic punching technique is done in this way, but with much greater exaggeration while we pivot back and forth as if a pole was stuck thru our centerline into the ground and we were pivoting around it. Most people from an Okinawan/Japanese/Korean/Kenpo background would probably believe it is over exaggerated and poor technique. In fact, if you understand what is being accomplished, it makes a lot of sense and with this methodology you can hit like a sledgehammer while expending surprisingly little effort.
If you don't understand the method properly, nor what is being accomplished, then it is understandable that you would feel it is not a good method.