Aloha Sibaya,
You know how you cup your head, arms, chest, and kidneys during the Harversting of Qi exercises? Same thing, just that it's on C7.
You probably already cup your collarbone/sternum area when you have congestion. What you're doing is activating some lung points (or the windows to the lungs, as Chunyi would say), to help open them.
Much Love, Shawn
