Here is a short (ten minute) video shot in Thailand in early 20104. It shows Damo teaching a small group of students how to prepare their body for any breathing exercises. The ribs are massaged and the diaphragm is stretched.
This helps with expanding the lungs and lengthening the breath which is an important part of any internal arts practice.
This clip was taken from the Dragon Dao Yin DVD which is available elsewhere on this site.