Fushin refers to movement in the upward direction. It is the opposite of Chinshin, which deals with movement in the downward direction. The term Fushin, which I learned from Kazumasa Yokoyama sensei, is not often used but essential to understand nevertheless.
Forget about twisting your hips for just a second (yes really).
Rather, think about why you should twist your hips?
Generate power, right? Yes basically that's the reason. But twisting your hips (rotational energy) is not the only way to generate power. In fact, rotation may take too long and might not be that effective in reality.
In a way, rotational energy deals with generating power from movement in the horizontal plane. From left to right or the other way around. Literally.
Fushin is to create power by movement in the vertical plane.
For completeness, you can say Fushin Ho. Let's have a look at the Kanji.
Fu (浮) = Rising to the surface
Shin (身) = Body
Ho (法) = Method
Fushin Ho is the method whereby you generate power by making your body rise to the surface i.e. in the upward direction. It is a different way of generating power compared to rotational hip movement.
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