Earth
Wall-Contact Hysteresis Loop
Stand against a wall, heels and back lightly in contact. Map the width of that loop: how far past the contact point you must go to break contact, versus how far back you must come to remake it.
Full Lesson Notes
Complete Practice
Stand against a wall, heels and back lightly in contact. Press a fingertip into the wall at sternum height and rock the body forward off the wall, then back, very slowly. There is a moment of separation and a moment of recontact, and a hysteresis loop between them — you separate at one weight distribution and recontact at a slightly different one. Map the width of that loop: how far past the contact point you must go to break contact, versus how far back you must come to remake it. Challenge: Without instrumentation the loop width is felt, not measured — change-with-attention may be confounded with change-with-fatigue.
