https://youtube.com/shorts/FJxm-fa201U?feature=share
NOT TO BE CONFUSED WITH EVERYDAY nasal in and nasal out breathing where tongue constantly suctions up and back on the roof of your mouth.
Sprinting or jump-roping or other high cardio effort that's brief with full recovery. I do this 2-3X/week with plenty of rest in between each attempt. I do a rolling/bouncing start then sprint as hard as I can for as long as I feel like it which ends up being about 15 sec. each time. It takes me a bit to recover then I repeat. I never do high-intensity when anything feels off. I re-align myself in between all-out bursts. I never repeat 2 days in a row. More rest is better.