Developing "circular breathing" Step 1: Breath with your mouth closed. Concentrate on what your mouth is doing (which is not much). Step 2: Continue with step 1 (ie: keep breathing through nose) Fill your cheeks, puff them out, make yourself look very silly. Hold that pose. Hold hold hold that "cheek air". Step 3: Focus on your nasal breaths but manipulate that stored captured air in your cheeks. Do not release it. Just move it around (left side right side front over teeth etc). Keep breathing through your nose. Step 4: Focus on your nasal "in-breath" as well as your cheek muscles. Compress the air in your cheeks each time you breath in. Dont release the air yet. Really squash that air. Pressure pressure pressure. Experiment with "synchronising the compression with your in-breaths. Step 5: Focus on lip muscles and in-breath. As you breath in release lips very slightly. Very very slightly. Compress that stored air and expell it out through your lips. Dont get to intellectual about what your nose is doing (ie breathing in). Just breath and focus on those cheek and lip muscles. Step 6: Do it all again and again.