Bill Hartman 9:30–11:47
So, no matter what movement you're making, you can create a yield by creating a compressive strategy as long as you have the yielding capability. If you have a learned behavior creating a compressive strategy on the front and backside of the body at the same time, you get squeezed between them. One of the goals when restoring relative motion is to produce these compressive strategies while also creating the shape that allows the yield to occur. This is why superimposing breathing on top of things is helpful because the air follows the path of least resistance and allows shape changes to occur. You mentioned ground contact has a lot to do with yielding because that's how we create the potential energy we use to move through space. We take the ground contact, absorb the energy into the tissues, which is the expanded representation of connective tissue—the yield. The yield represents potential energy, like pulling back a rubber band, expanding a balloon, or pushing down on a trampoline. When you push down on the trampoline, it expands and throws you back up in the other direction—that's what we're trying to produce with connective tissues. You can produce this within yourself, but in cases where someone in rehab has had pain-related issues or an athlete has restricted movement, they may have such a strong behavior that they can't produce the gradient between the compressed and expanded representations. That's where manual therapies, ground contacts, and leading resistances come into play because we can use resistance to create compression in one space and expansion in another. The goal is to create the gradient between the two because movement requires a gradient. If we take away your entire gradient, you can't move at all.
yielding representationcompressive strategyconnective tissue behaviorground contactpotential energy