Trouble

The current wasn't at all visible to the naked eye and instead, unless you had some special sort of eye power or a certain amount of strength could you see the lines and mystical markings.

Remembering what he had read and the process he had to go through, David closed his eyes as though in meditation and then, his breathing began to undulate as he breathed according to the breathing technique written in the manual. 

David's breathing continued to undulated and his chest started to fall and rise uncontrollablely, without any rhyme or rhythm.

The technique placed its entire focus on the breathing aspect which calms the mind and also stimulates the brain activities to flow in a certain direction, amplifying the electrical signals in the brain by about a hundred times without electrifying the brain.

It was a very tasking work and in just thirty seconds, David begun to sweat bullets of sweat, forming a large pool underneath him.