The Bellows

Forceful two-way breathing like Bhastrika mobilizes the diaphragm and accessory respiratory muscles with rapid, repeated inhalations and exhalations. That active pumping increases air exchange and transiently lowers arterial CO2 (hypocapnia), which raises blood oxygen content and can narrow cerebral blood vessels — producing lightheadedness for some people. The vigorous movement also increases metabolic heat and sympathetic arousal, which practitioners experience as internal warmth and alertness.

On a neural level, deep and active breath patterns strongly engage brainstem respiratory networks and influence autonomic outflow via the vagus nerve and baroreflex pathways. Rapid, forceful breaths tend to reduce parasympathetic (vagal) tone and increase sympathetic drive while also providing a powerful interoceptive signal: the body’s sensors for stretch, pressure, and gas levels report back changes in a way that shifts attention and emotional state. Practiced in short, controlled rounds, this can sharpen focus and clear sensations; done too long or without preparation it can cause dizziness, tingling, or anxiety because of altered CO2, pH, and cerebral blood flow.

From a psychological standpoint, the strong somatic feedback from bellows breath increases bodily awareness (interoception) and can rapidly change mood and arousal. That makes Bhastrika useful when the goal is energizing or clearing the mind, but it also means it should be used intentionally, with awareness of contraindications (cardiovascular issues, pregnancy, vertigo) and with gradual buildup to avoid overstimulation or hyperventilation effects.