I would have to say the contrary to that. The human body is made up of energy, protons, neutrons, electrons, and massive jumble of atoms forming elements (periodic table) which make up our coherent "mass". We are not physical beings, we are only seen as a physical being. We are all in fact a massive culmination of such elements, held together by electrical bonds. Not only so but the human body is a pretty efficient conductor of energy.
Theoretically, electrokinesis is possible. When you look at paranormal examples like psychokinesis or telekinesis you start to delve into a subject which is not fully researched. The field containing people who have claimed and given shows of their abilities of moving inanimate objects, controlling animals, reading minds, and ofcourse controlling elements using energy of the body. (I will leave a link to the start point to the research)
As we do not know everything from the field of kinesis, we cannot go out and declare that it is not possible. You can only say it is not possible to your knowledge.
As I have said, the body has the capacity to be a conductor, and we do not know the extent of the human mind. Not only so but there are electro-conductive species on the planet. Evolution and the human species is still a very unknown feild.
As witches and practitioners of the craft I think we should all be trying to solve these mysteries and questions, as we have for generations done things thought to be impossible. That is the nature of being a practitioner of the craft no?
Some examples of this would be spirits, summonings, conjurings, fortune telling, necromancy, spells, rituals for any purpose or use, astral projection!
I firmly believe this is possible, we just need to research and discover. I hope someone posts here for you to learn under Killjoy and don't let anyone tell you that things are impossible. Until we search every known possibility we cannot declare it to be impossible.
I may not have the answer bud, but at least I can give you some hope. If you don't find a practitioner who has discovered the path, i'm happy to learn with you.