MONTAGE Doctor inserting and removing hypodermic needle into patient's side for biopsy / United Kingdom

The video tutorial guides Sir Donald through a breathing exercise. Initially, he is instructed to hold his breath while breathing out and then to breathe normally. The exercise is repeated multiple times, with pauses for holding breath and resuming normal breathing. The session concludes with final instructions and a wrap-up.

What new insight or understanding did you gain from this video?