How to Peng

I learnt something today while pushing hands. It came about because I was not doing my peng properly. My opponent pointed out that my arm was becoming flat (my upper arm was pressed against my body), so he was able to push me each time. The way to remedy this is to peng so that he cannot push me properly. This was during two-hands pushing hands. Basically, I should peng such that his hand that is on my wrist is unable to push properly. That was when I realised how to use his strength to peng. By relaxing my kua, relaxing my arm, I was able to use the force of his arm (the one pushing my elbow) to peng, preventing his other arm from pushing at my wrist properly. Basically, transfer the force acting on my elbow towards my wrist. Come to think about it, this is similar to Pie Shen Cui 撇身摧 that my teacher once told me about. "Return his force acting on your elbow back to him."