Air
Quadrature-Arm Sternal Node Migration
Supine, arms at sides, set the right arm swinging at the shoulder in small arcs across the floor at a comfortable tempo, then start the left arm at the same tempo but deliberately a quarter-cycle out of phase. Locate the sternal site where the two arms' contributions cancel —...
Full Lesson Notes
Complete Practice
Supine, arms at sides, set the right arm swinging at the shoulder in small arcs across the floor at a comfortable tempo, then start the left arm at the same tempo but deliberately a quarter-cycle out of phase. Sustain the quadrature phase-lock for twenty cycles. Locate the sternal site where the two arms' contributions cancel — the standing-wave node of the upper thorax. Then slowly drift the left arm toward in-phase coupling and track how the node travels across the chest, possibly crossing midline. Challenge: Phase drift control by feel is rough; quarter-cycle precision is unlikely without a metronome, so the node migration may jump rather than slide.
