Hyperventilation decreases CO2 and increases overall oxygen in the bloodstream while moving blood pH from acidic to alkaline. During retention (with lungs full of air) you sequentially tighten all the muscles from your extremities toward the place where you want to move the blood supply. The process is a little bit like wringing out a wet rag from one end to another and pushing the water out. It’s hard to say exactly what you’re physically moving inside the brain when you’re targeting a headache; perhaps it’s the smooth muscles in its vasculature, or perhaps you’re just thinking at a
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