This movement activates:
Lumbar Flexion: Stretches Governor Vessel → Du-4 (ming men xue) ignition
Hand-Grasp Toes: Stimulates BL-40 (wei zhong xue) + BL-60 (kun lun xue)
Renal Pump Mechanism: Diaphragm compression increases renal perfusion 28% (J Physiol)