The back remains peng to protect the back. The front peng protects the front. Back and front peng occur together. Arms push out with peng connecting directly to shoulders and protecting the chest.

Peng on the outside parts of the body equals connections and peng on the inside. Connection creates full energy.

When the left side has peng it is easier for the right side to have peng. When one side does not have peng it is easier for the other to not have peng.

When the arm is peng it extends and connects the joints so that there is no blockage in the elbow or the hand.  When there is no blockage in the joints then contact takes place with the dantian with looseness, connection and peng.