Please choose the correct ending to complete the given sentence: Health: [header] How to circular breathe [title] Fill your cheeks with air, and breathe in and out through your nose. [step] What you're doing is establishing a second source of air that you can use when your lungs run out. [substeps] While this may make you look like a chipmunk, the more useful analogy is to think of yourself as a human bagpipe, and your cheeks as the bellows.

Ending1: [title] Blow out the air you have been holding in your mouth. [step] Close your jaw, but make a tiny opening in your mouth, and use your cheek muscles to push the air out slowly. Ending2: Breathe in and out through your nose as fast as you possibly can. Do not rush, and instead try to breathe steadily and completely into your mouth. Ending3: [title] Inhale one deep breath into one nostril. [step] As you breathe in deeply, lean forward so that your chin can go almost entirely into your nostril. Ending4: However, this approach will not guarantee a clear nose. [title] Take your breath from your diaphragm.

Answer format: ending1/ending2/ending3/ending4