Take a hackie sack. Put it under your upper spine about T1-T4. Lie on your back legs bent feet on floor. Squish the hackie sack without lifting your butt off the floor. Voila. If it works for you...great. Want me to explain WHAT it does? I can't....well, not really. Want me to explain WHEN one is ready for this? I can't. I'm not a PT. I was merely told that it helped me. I could sort of see this FOR ME. I was told it was helping others. Until I came up with the hackie sack part, the PT was having difficulty communicating what she wanted her patients to DO and HOW to get the task accomplished. Sometimes were are told in PT to perform a movement and we don't understand or see WHY. Trust process sometimes. I doubt the explanation of the maneuver helped anyone but if it did...great. It is way out of context.