Nonsensical hogwash!
Without bodily elecricity, your brain neurons would'nt work.
Our bodies are made up of protons, neutrons and electrons, when the protons and electrons are not in balance an electrical charge results.Without electrical charges no signal from the nervous system would be processed. This talk of "excess electricity" is a shamelessly juvenile attempt at justifying some ancient supersistious religious rites on scientific grounds, the mere premise is childishly unscientific.
One can prescribe a thousand and one ways of getting rid of bodily electricity, why should this ancient rite be anything special?
Save yourself the embarassment.