Śivasaṃhitā 4.101

The verse introduces a practice that uses the act of urination (svamūtrotsarga) as a moment of yogic intervention: at that precise instant, the practitioner redirects the flow upward through control of vāyu (air/prāṇa). The technique belongs to the domain of sphincter and internal vāyu control, specifically the mastery of apāna, the downward-moving air governing elimination functions.

Svamūtra («one’s own urine») also appears in āyurvedic medical contexts and in certain tantric-alchemical currents where bodily fluids are regarded as carriers of subtle energy. The term balāt (by force, with effort) indicates that the practice requires active, deliberate muscular contraction — not mere relaxation. The vāyu here is the instrument of the action.

The practice described relates to pelvic floor control techniques systematized in hatha yoga under the names mūla bandha and aśvinī mudrā. The instruction specifically during urination is precise: at that moment apānavāyu is in full downward activity, and reversing it demands maximum conscious effort, thereby training control over this fundamental prāṇic current.