Suction
Whether on the surface of the ground or wall, you move with as much surface of the body suctioned to the ground or wall as possible. You can also imagine a high gravity or centrifugal force situation.
Exercise: Pushing Partner
We might not be aware how much more body surface we can touch to either the ground or wall, so a partner will see any gaps and gently push any of these areas, whether with the hands or other parts of the body.