BK Frantzis mentions that sinking energy will produce rising energy but not necessarily the other way around. Never heard that as far as I know. Tried it out. Felt like a physical rebound and an energetic rebound. Not quite simultaneous rooting and expanding. More of a change from one to the other. Conjures up the taiji diagram. Borrowing force and spiraling yang down to yin and back up to yang. Pretty much it.