Think about this: everything is moving, all the time. At a basic level, what is everything made of? Atoms. What are atoms made of? Protons, neutrons, and electrons. What are electrons doing? Well, no one really knows for sure, but they're certainly not sitting still. Scientists used to think that they moved in a stable orbit around the center of the atom, then they thought that electrons existed in a sort of cloud with no set pattern. The latest theory is that electrons sort of "pop" in and out of existence in different parts of the universe. In other words, electrons aren't tied to any particular atom.
When you meditate, you will feel a certain stillness. But as things settle down and the outside world falls away, you will become more attuned to what Huaching Ni calls the subtle vibrations of the universe. If you get to a certain level, wouldn't it be possible to suggest to your electrons, your particles, your qi, to move in a certain way? To move in a healthy direction? Can meditation cure your illnesses?