To see what isn’t there, as if it was is the true meaning of Yugen. To force the invisible to become visible is what you can call mama. Yugen is occult and mama is magic. Let go of your ego. Once you do that, there is nothing that is impossible.
--- Kusakabe Kakugo.
Mama Ryuutai Jutsu is a technique that renders user’s kicks invisible to the naked eye. Excessive force and speed aren’t the key elements one has to let go of the concept of muscle, speed, and stamina and just make use of the move itself. It’s not about the heart behind each kick; it’s about using the center of the body. Once mastered a new and unexpected force is born from user’s moves.